# Contraction

(Redirected from Contraction (mathematics))

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Look up or contraction in Wiktionary, the free dictionary.contracted |

**Contraction** may refer to:

## Linguistics[edit]

- Contraction (grammar), a shortened word
- Poetic contraction, omission of letters for poetic reasons
- Elision, omission of sounds
- Syncope (phonology), omission of sounds in a word

- Synalepha, merged syllables
- Synaeresis, combined vowels
- Crasis, merged vowels or diphthongs

## Mathematics and logic[edit]

- Contraction (operator theory), in operator theory, state of a bounded operator between normed vector spaces after suitable scaling
- Contraction hierarchies, in applied mathematics, a technique to speed up shortest-path routing
- Contraction mapping, a type of function on a metric space
- Edge contraction or vertex contraction, graph operations used in graph theory
- Tensor contraction, an operation on one or more tensors that arises from the natural pairing of a finite-dimensional vector space and its dual
- One of the rules of conditional independence, in probability
- Contraction (logic), a structural rule in proof theory

## Medicine[edit]

- Muscle contraction, the physiological condition of a muscle which generates tension (traction) at its origin and insertion
- Uterine contraction, contraction of the uterus, such as during childbirth

- Contractility, the intrinsic ability of the heart/myocardium to contract
- Wound contraction, a stage in wound healing

## Other uses[edit]

- Contraction (economics), a general slowdown in economic activity; the opposite of economic expansion
- Contraction (physics), change in the volume of matter in response to a change in temperature
- Lanthanide contraction, the decrease in size of the ionic radius of lanthanide elements with their growing atomic number
*Contracted*(film), a 2013 horror thriller film by Eric England and its sequel*Contracted: Phase II*(2015) which directed by Josh Forbes