Reciprocal

Reciprocal may refer to:

In mathematics

• Multiplicative inverse, in mathematics, the number 1/x, which multiplied by x gives the product 1, also known as a reciprocal
• Reciprocal polynomial, a polynomial obtained from another polynomial by reversing its coefficients
• Reciprocal rule, a technique in calculus for calculating derivatives of reciprocal functions
• Reciprocal spiral, a plane curve
• Reciprocal averaging, a statistical technique for aggregating categorical data

In science and technology

• Reciprocal aircraft heading, 180 degrees (the opposite direction) from a stated heading
• Reciprocal lattice, a basis for the dual space of covectors, in crystallography
• Reciprocal length, a measurement used in science
• Reciprocating engine or piston engine
• Reciprocating oscillation in physical wave theory

Life sciences and medicine

• Hybrid (biology), in genetics, the result of a reciprocal pair of crossings, forming reciprocal hybrids
• Reciprocal altruism, a form of symbiotic relationship in evolutionary biology
• Reciprocal cross, a breeding experiment in genetics
• Sherrington's law of reciprocal innervation in the theory of muscle activation

Social sciences

• Reciprocal determinism, a theory in psychology

Linguistics

• Reciprocal construction, a construction in which agent and patient are in a mutual relationship

In reciprocal relationships

• Reciprocal license, a type of software licenses also known as copyleft
• Reciprocal link between two web pages
• Reciprocal obligation, in law, a type of agreement between two individuals
• Reciprocal Public License (RPL), a software license

See also

• Reciprocation (disambiguation)
• Reciprocity (disambiguation)

1. Reciprocal lattice
2. Reciprocal length
3. Multiplicative inverse
4. Reciprocal liking
5. Lineweaver–Burk plot
6. Reciprocal determinism
7. Reciprocal construction
8. Reciprocal inhibition
9. Reciprocal altruism
10. Mean reciprocal rank
11. Reciprocal frame
12. Brillouin zone
13. Inverse distribution
14. Reciprocal distribution
15. Reciprocal obligation
16. Reciprocal rule
17. Symmetric-key algorithm
18. Reciprocal polynomial
19. Reciprocal pronoun
20. Reciprocal teaching