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Physical quantity
Reciprocal length or inverse length is a quantity or measurement used in several branches of science and mathematics, defined as the reciprocal of length
Reciprocal_length
Class of units of measurement
volume equal to 1 m3. The dioptre is a unit of optical power equal to one reciprocal metre (1 m−1). The kayser is a unit of wavenumber equal to 105 m-1 (1000
List_of_metric_units
Measure of distance in physical space
Arc length Humorous units of length Length measurement Metric system Metric units Orders of magnitude (length) Reciprocal length Look up length, distance
Length
Topics referred to by the same term
direction) from a stated heading Reciprocal lattice, a basis for the dual space of covectors, in crystallography Reciprocal length, a measurement used in science
Reciprocal
Measure of how strongly an optical system converges or diverges light
equal to the reciprocal of the focal length, expressed in metres. A dioptre is its unit of measurement with dimension of reciprocal length, equivalent
Focal_length
Unit of measurement of optical power
dpt or D, is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, 1 dpt = 1 m−1. It is normally used to express
Dioptre
Fourier transform of a real-space lattice, important in solid-state physics
space has the dimension length (L), its reciprocal space will have inverse length, so L−1 (the reciprocal of length). Reciprocal space comes into play regarding
Reciprocal_lattice
Spatial frequency of a wave
divided by length; it is a physical quantity with dimension of reciprocal length, expressed in SI units of cycles per metre or reciprocal metre (m−1)
Wavenumber
Physical spaces representing position and momentum, Fourier-transform duals
"k-vector") has dimensions of reciprocal length, making it an analogue of angular frequency ω which has dimensions of reciprocal time. The set of all wave
Position_and_momentum_spaces
Unit of frequency
The inverse second or reciprocal second (s−1), also called per second, is a unit defined as the multiplicative inverse of the second (a unit of time).
Inverse_second
Sequence of numbers
q such that the period length of the decimal expansion of its reciprocal, 1/p, is equal to the period length of the reciprocal of q, 1/q. For example
Reciprocals_of_primes
Kilometre per square kilometre is an SI derived unit of reciprocal length used for measurement of density of a linear feature in an area. It is used to
Kilometre per square kilometre
Kilometre_per_square_kilometre
Unit of length
fixed-width CJK fonts. Conversion of units Orders of magnitude (length) Reciprocal length "Decimal multiples and submultiples of SI units". Bureau International
Centimetre
Number which when multiplied by x equals 1
In mathematics, a multiplicative inverse or reciprocal for a number x, denoted by 1 x {\displaystyle {\tfrac {1}{x}}} or x−1, is a number which when multiplied
Multiplicative_inverse
Arrangement of construction beams
A reciprocal frame is a class of self-supporting structure made of three or more beams and which requires no center support to create roofs, bridges or
Reciprocal_frame
Cryptographic algorithm
plaintext. A reciprocal cipher is also sometimes referred as self-reciprocal cipher. Practically all mechanical cipher machines implement a reciprocal cipher
Symmetric-key_algorithm
Technique to analyze the infrared spectrum of matter
belongs in the length dimension. Fourier transform (FT) inverts the dimension, so the FT of the interferogram belongs in the reciprocal length dimension([L−1])
Fourier-transform infrared spectroscopy
Fourier-transform_infrared_spectroscopy
Topics referred to by the same term
cm−1, it may refer to: Inverse centimetre, unit of measurement: see Reciprocal length This disambiguation page lists articles associated with the same title
CM1
mathematics and number theory, the sum of reciprocals (or sum of inverses) is defined as the sum of reciprocals of some series of positive integers (counting
List_of_sums_of_reciprocals
Units defined only by physical constants
in Planck units, it was noted that this is suggestively close to the reciprocal of the age of the universe (T) squared. Barrow and Shaw proposed a modified
Planck_units
Light or sound absorption in a substance
reciprocal metre (m−1). Extinction coefficient is another term for this quantity, often used in meteorology and climatology. The attenuation length is
Attenuation_coefficient
Analysis of the dimensions of different physical quantities
Ln+m). Physically, 1/L can be interpreted as reciprocal length, and 1/T as reciprocal time (see reciprocal second). An abelian group is equivalent to a
Dimensional_analysis
Dimensionality of space at which the character of the phase transition changes
that the exponents N {\displaystyle N} count wave vector factors (a reciprocal length k = 1 / L 1 {\displaystyle k=1/L_{1}} ). Each monomial of the Lagrangian
Critical_dimension
Mathematical formula for the number of Young tableaux
contain the minimum element of the corresponding hook is the reciprocal of the hook length. Multiplying these probabilities over all i {\displaystyle i}
Hook_length_formula
One of the five 2D Bravais lattices
120° and are of equal lengths, | a 1 | = | a 2 | = a . {\displaystyle |\mathbf {a} _{1}|=|\mathbf {a} _{2}|=a.} The reciprocal lattice of the hexagonal
Hexagonal_lattice
Babylonian clay tablet of numbers in Pythagorean triples
consist of a reciprocal pair. For each part the lengths of both the diagonal and the width (short side) of a rectangle are computed. The length (long side)
Plimpton_322
Mass per unit length
simply "density") are also often used, with resulting units involving reciprocal metre (m−1), for example: linear mass density or lineic mass linear charge
Linear_density
Number, approximately 1.618
It is in fact the simplest form of a continued fraction, alongside its reciprocal form: φ − 1 = [ 0 ; 1 , 1 , 1 , … ] = 0 + 1 1 + 1 1 + 1 1 + 1 ⋱ {\displaystyle
Golden_ratio
SI-derived unit of area
kilometre is (103)3 (109, one billion) cubic metres. Its inverse is the reciprocal square metre (m−2), often called "per square metre". The square metre
Square_metre
=2\pi /k} . Often, momentum transfer is given in wavenumber units in reciprocal length Q = k f − k i {\displaystyle Q=k_{f}-k_{i}} Momentum transfer is an
Duane's_hypothesis
Perpendicular line segment from a triangle's side to opposite vertex
\textstyle H={\tfrac {1}{2}}(h_{a}^{-1}+h_{b}^{-1}+h_{c}^{-1})} then the reciprocal of area is A r e a − 1 = 4 H ( H − h a − 1 ) ( H − h b − 1 ) ( H − h c
Altitude_(triangle)
Sum of inverse squares of natural numbers
the problem. The Basel problem asks for the precise summation of the reciprocals of the squares of the natural numbers, i.e. the precise sum of the infinite
Basel_problem
Set of coordinates where the coordinate hypersurfaces all meet at right angles
as the covariant vectors but reciprocal length (for this reason, the two sets of basis vectors are said to be reciprocal with respect to each other):
Orthogonal_coordinates
the neighbouring countries and territories. The length of each border is included, as is the total length of each country's or territory's borders. Countries
List of countries and territories by number of land borders
List_of_countries_and_territories_by_number_of_land_borders
Numbers obtained by adding the two previous ones
over reciprocal Fibonacci numbers can sometimes be evaluated in terms of theta functions. For example, the sum of every odd-indexed reciprocal Fibonacci
Fibonacci_sequence
Fundamental trigonometric functions
The reciprocal of sine is cosecant, which gives the ratio of the hypotenuse length to the length of the opposite side. Similarly, the reciprocal of cosine
Sine_and_cosine
Model of rotating physical systems
{\textrm {with}}\quad B\equiv {\frac {\hbar ^{2}}{2I}}.} In the units of reciprocal length the rotational constant is, B ¯ ≡ B h c = h 8 π 2 c I = ℏ 4 π c μ
Rigid_rotor
Quotient of a quantity by mass
leaf area is leaf area divided by leaf mass. Derived SI units involve reciprocal kilogram (kg−1), e.g., square metre per kilogram (m2⋅kg−1); the expression
Specific_quantity
Concept in condensed matter physics
is the limit of the Lindhard formula when the wavevector (the reciprocal of the length-scale of interest) is much smaller than the Fermi wavevector, i
Thomas–Fermi_screening
Social media platform owned by Meta
Steven (October 2017). "Browsing, Posting, and Liking on Instagram: The Reciprocal Relationships Between Different Types of Instagram Use and Adolescents'
Instruction set extension by Intel
Landing and Skylake X AVX-512 Exponential and Reciprocal Instructions (ER) – exponential and reciprocal operations designed to help implement transcendental
AVX-512
Cushitic language
suffixes: mataa koo 'myself', mataa kee 'yourself (s.)', etc. Oromo has a reciprocal pronoun wal (English 'each other') that is used like of/if. That is, it
Oromo_language
Administrative entry restrictions
bhclondon.org.uk. Retrieved 7 February 2024. Barbados Visa Requirements and Reciprocal Arrangements, Ministry of Foreign Affairs and Foreign Trade of Barbados
Visa requirements for Colombian citizens
Visa_requirements_for_Colombian_citizens
Electric and magnetic fields produced by moving charged objects
vary widely depending on the frequency, intensity of the fields, and the length of the exposure. Low frequency, low intensity, and short duration exposure
Electromagnetic_field
Ancient Greek concept of hospitality
patrons of foreigners. The rituals of hospitality created and expressed a reciprocal relationship between guest and host expressed in both material benefits
Xenia_(Greek)
Army Chief General K. M. Cariappa visited Nepal, awarding the highest reciprocal honorary ranks to the newly appointed serving chiefs of each other's armies
Indian Army ranks and insignia
Indian_Army_ranks_and_insignia
Physics theorem about a swimmer's displacement
In physics, the scallop theorem states that a swimmer that performs a reciprocal motion cannot achieve net displacement in a low-Reynolds number Newtonian
Scallop_theorem
Mathematical model combining space and time
measurements, there is no inherent necessity that the measurements be reciprocally "consistent" such that, if one observer measures the moving clock to
Spacetime
Measure of electromagnetic transmission
(capacitance per length, in farads per metre), and c 0 {\displaystyle c_{\mathrm {0} }} is the speed of light in vacuum. VF equals the reciprocal of the refractive
Velocity_factor
1989 studio album by Tad
Tad Released March 1, 1989 (1989-03-01) Studio Reciprocal (Seattle) Genres Alternative metal grunge Length 37:34 Label Sub Pop Producer Jack Endino Tad
God's_Balls
Mathematical functions
lemniscate elliptic functions are elliptic functions related to the arc length of the lemniscate of Bernoulli. They were first studied by Giulio Fagnano
Lemniscate_elliptic_functions
American country club
Sedgefield Country Club and added new membership benefits, including reciprocal access to the 14 other McConnell Golf properties. From 2003 until 2021
Sedgefield_Country_Club
Functions of an angle
mathematics are the sine, the cosine, and the tangent functions. Their reciprocals are respectively the cosecant, the secant, and the cotangent functions
Trigonometric_functions
Tendency of matter to change volume in response to a change in temperature
increase in size with increasing temperature. Matter generally increases in length, area, and volume, changing its size and density, in response to an increase
Thermal_expansion
Final Pharaoh of the 18th dynasty of Egypt
diplomatic mission to visit the Nubian governors. This resulted in a reciprocal visit by "the Prince of Miam (Aniba)" to Tutankhamun's court, "an event
Horemheb
1989 studio album by Nirvana
in preparation for recording a full-length album. The main recording sessions for Bleach took place at Reciprocal Recording in Seattle, Washington between
Bleach_(Nirvana_album)
Visa requirement policy for Indian citizen
Association (IATA), Travel Information Manual Barbados Visa Requirements and Reciprocal Arrangements, Ministry of Foreign Affairs and Foreign Trade of Barbados
Visa requirements for Indian citizens
Visa_requirements_for_Indian_citizens
Spiral asymptotic to a line
a.} Because of the reciprocal relation between r {\displaystyle r} and φ {\displaystyle \varphi } it is also called a reciprocal spiral. The same relation
Hyperbolic_spiral
Law of electrical current and voltage
V=IR} or, equivalently, at the same equation expressed in terms of the reciprocal constant of proportionality, the electrical conductance, I = G V {\displaystyle
Ohm's_law
Relation between sides of a right triangle
{1}{15^{2}}}={\frac {1}{12^{2}}}} using the smallest Pythagorean triple 3, 4, 5. The reciprocal Pythagorean theorem is a special case of the optic equation 1 p + 1 q
Pythagorean_theorem
SI derived unit of volume
1 mm3 = 0.000000001 m3 = 10−9 m3 = 1 μL Orders of magnitude (volume) Reciprocal cubic metre Standard cubic foot Bureau International de Poids et Mesures
Cubic_metre
specialbranch.gov.bd. Retrieved May 31, 2026. Barbados Visa Requirements and Reciprocal Arrangements, Ministry of Foreign Affairs and Foreign Trade of Barbados
Visa requirements for United States citizens
Visa_requirements_for_United_States_citizens
Understanding of gas properties in terms of molecular motion
collision cross section per volume n σ {\displaystyle n\sigma } is reciprocal of length. The kinetic theory of gases deals not only with gases in thermodynamic
Kinetic_theory_of_gases
Penetrative sexual activity for reproduction or sexual pleasure
suggesting later marriage and reciprocal valuing of male and female virginity. The same pattern of late marriage and reciprocal valuing of virginity was reflected
Sexual_intercourse
Notation system for crystal lattice planes
the lattice vectors are orthogonal and of equal length (usually denoted a), as are those of the reciprocal lattice. Thus, in this common case, the Miller
Miller_index
Capacity of a material to conduct heat
temperature gradient (K·m−1) in the direction of heat transport. The reciprocal of thermal conductivity is called thermal resistivity. Materials with
Thermal conductivity and resistivity
Thermal_conductivity_and_resistivity
Travel regulations abroad
Association (IATA), Travel Information Manual Barbados Visa Requirements and Reciprocal Arrangements, Ministry of Foreign Affairs and Foreign Trade of Barbados
Visa requirements for Malaysian citizens
Visa_requirements_for_Malaysian_citizens
Administrative entry restrictions
Association (IATA), Travel Information Manual Barbados Visa Requirements and Reciprocal Arrangements, Ministry of Foreign Affairs and Foreign Trade of Barbados
Visa requirements for Philippine citizens
Visa_requirements_for_Philippine_citizens
Measure of lens speed
such as a camera lens. It is defined as the ratio of the system's focal length to the diameter of the entrance pupil ("clear aperture"). The f-number is
F-number
Administrative entry restrictions
Association (IATA), Travel Information Manual Barbados Visa Requirements and Reciprocal Arrangements, Ministry of Foreign Affairs and Foreign Trade of Barbados
Visa requirements for Thai citizens
Visa_requirements_for_Thai_citizens
Tiger and lioness hybrid
miniaturization; they often weigh around 180 kg (400 lb). It is distinct from the reciprocal cross, the liger, which is a hybrid of a male lion and a female tiger
Tigon
Systems for measuring textiles
cotton count (or Number English (Ne)), Number metric (Nm) and yield (the reciprocal of denier and tex). A yarn or thread, a spun agglomeration of fibers used
Units_of_textile_measurement
Observation in physical cosmology
the speed of a galaxy 1 megaparsec (3.09×1019 km) away as 70 km/s. The reciprocal of H0 is the Hubble time (14.4 billion years). The Hubble constant can
Hubble's_law
Opposition to the passage of an electric current
object is a measure of its opposition to the flow of electric current. Its reciprocal quantity is electrical conductance, measuring the ease with which an electric
Electrical resistance and conductance
Electrical_resistance_and_conductance
Entry restrictions by the authorities of other states placed on citizens of Pakistan
"Bangladesh High Commission". bdhcpk.org. Barbados Visa Requirements and Reciprocal Arrangements, Ministry of Foreign Affairs and Foreign Trade of Barbados
Visa requirements for Pakistani citizens
Visa_requirements_for_Pakistani_citizens
Methods of error detection and correction in communications
0 0 1 |0 0 0 1] Reciprocal [ 0 | 8 | 1 | 1 ] Nibbles of Reciprocal 0x0811 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Reverse reciprocal 16 15 14 13 12 11
Mathematics of cyclic redundancy checks
Mathematics_of_cyclic_redundancy_checks
Part of the Israeli–Palestinian conflict
Affairs Committee of the Knesset spoke with great intemperance and at great length to us about the Arabs. When he drew breath I was constrained to say, 'Doctor
Dehumanization of Palestinians in Israeli discourse
Dehumanization_of_Palestinians_in_Israeli_discourse
Attraction on the basis of sexual desire
preponderance of common or familiar features, similarity, complementarity, reciprocal liking, and reinforcement. The ability of a person's physical and other
Sexual_attraction
Administrative entry restrictions
Association (IATA), Travel Information Manual Barbados Visa Requirements and Reciprocal Arrangements, Ministry of Foreign Affairs and Foreign Trade of Barbados
Visa requirements for Egyptian citizens
Visa_requirements_for_Egyptian_citizens
1984 book by Robert Axelrod
strategy. Even when the discount parameter ω is high enough to permit reciprocal cooperation there is still a question of whether and how cooperation might
The_Evolution_of_Cooperation
Administrative entry restrictions
Association (IATA), Travel Information Manual Barbados Visa Requirements and Reciprocal Arrangements, Ministry of Foreign Affairs and Foreign Trade of Barbados
Visa requirements for Brazilian citizens
Visa_requirements_for_Brazilian_citizens
1987 EP by Soundgarden
compilation album in 1990. The EP was recorded in Seattle, Washington, at Reciprocal Recording with producer Jack Endino, who also produced albums for Nirvana
Screaming_Life
Equation of the form 1/a + 1/b = 1/c
an equation that requires the sum of the reciprocals of two positive integers a and b to equal the reciprocal of a third positive integer c: 1 a + 1 b
Optic_equation
1969 song by Shocking Blue
1988 and July 16, 1988 Studio Reciprocal Recordings, Seattle, Washington Genre Grunge alternative rock punk rock Length 3:35 3:45 (with intro) Label Sub
Love_Buzz
modulus of Γ {\displaystyle \Gamma } , the reciprocal of the extremal length. The fact that extremal length and conformal modulus are conformal invariants
Extremal_length
Extension of the factorial function
where it has simple poles. Since the gamma function has no zeros, its reciprocal 1 Γ {\displaystyle {\frac {1}{\Gamma }}} is an entire function. In fact
Gamma_function
Administrative entry restrictions
aged between 14 and 70. Diplomatic passport holders and beneficiaries of reciprocal agreements are exempted.. "Äthiopien: Reise- und Sicherheitshinweise"
Visa requirements for Chinese citizens
Visa_requirements_for_Chinese_citizens
Number of occurrences or cycles per unit time
The interval of time between events is called the period. It is the reciprocal of the frequency. For example, if a heart beats at a frequency of 120
Frequency
1990 studio album by L7
first six songs, it was reissued on CD in July 1991, expanded to album length with three more tracks: "Packin' a Rod," "Just Like Me," and "American Society
Smell_the_Magic
Babylonian mathematical clay tablet
"Thus we have a reciprocal pair of numbers with a geometric interpretation…". They point out that, while the importance of reciprocal pairs in Babylonian
YBC_7289
Crocodilian native to the Southeastern United States
on September 20, 2017. Nifong, James C.; Lowers, Russell H. (2017). "Reciprocal Intraguild Predation between Alligator mississippiensis (American Alligator)
American_alligator
Instructions". Voa.specialbranch.gov.bd. Barbados Visa Requirements and Reciprocal Arrangements, Ministry of Foreign Affairs and Foreign Trade of Barbados
Visa requirements for Indonesian citizens
Visa_requirements_for_Indonesian_citizens
2022. Honduras cancelled a visa-free regime for British citizens as a reciprocal measure in August 2024. Similarly, Namibia will introduce visas for British
Visa requirements for British citizens
Visa_requirements_for_British_citizens
1989 EP by Screaming Trees
December 1, 1989 Recorded 1989 Studios Reciprocal Recording, Seattle, Washington Genres Grunge psychedelia Length 17:36 Labels Sub Pop (048) Glitterhouse
Change_Has_Come
6750 Prescribing the Procedure for Notice and Hearing on Any Proposed Reciprocal Trade Agreement June 27, 1934 826 6750-A June 27, 1934 827 6750-B June
List of executive actions by Franklin D. Roosevelt
List_of_executive_actions_by_Franklin_D._Roosevelt
Slave trade between Africa and the West
3 February 2024. Sohns, Antonia (November 2024). "River definitions reciprocally define us". River Research and Applications. 40 (9): 1750. doi:10.1002/rra
Atlantic_slave_trade
Entry restrictions by the authorities of other states placed on citizens of Turkey
Association (IATA), Travel Information Manual Barbados Visa Requirements and Reciprocal Arrangements, Ministry of Foreign Affairs and Foreign Trade of Barbados
Visa requirements for Turkish citizens
Visa_requirements_for_Turkish_citizens
identities potentially involving angles but also involving side lengths or other lengths of a triangle. These identities are useful whenever expressions
List of trigonometric identities
List_of_trigonometric_identities
2015 American criminal case
register as a sex offender. He was placed on three years probation with reciprocal supervision through the Greene County, Ohio, Sheriff's Office. Conditions
People_v._Turner
Entry restrictions by the authorities of other states placed on citizens of the Canada
bhclondon.org.uk. Retrieved 13 April 2025. Barbados Visa Requirements and Reciprocal Arrangements, Ministry of Foreign Affairs and Foreign Trade of Barbados
Visa requirements for Canadian citizens
Visa_requirements_for_Canadian_citizens
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