Retraction or retract(ed) may refer to:
Academia
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Retraction in academic publishing, withdrawals of previously published academic journal articles
Mathematics
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Retraction (category theory)
In category theory, a branch of mathematics, a section is a right inverse of some morphism. Dually, a retraction is a left inverse of some morphism.
In other words, if f: X\to Y and g: Y\to X are morphisms whose composition f \circ g: Y\to Y is t ...
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Retract (group theory)
Retraction or retract(ed) may refer to:
Academia
* Retraction in academic publishing, withdrawals of previously published academic journal articles
Mathematics
* Retraction (category theory)
* Retract (group theory)
* Retraction (topology)
Hu ...
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Retraction (topology)
Human physiology
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Retracted (phonetics), a sound pronounced to the back of the vocal tract, in linguistics
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Retracted tongue root
In phonetics, advanced tongue root (ATR) and retracted tongue root (RTR) are contrasting states of the root of the tongue during the pronunciation of vowels in some languages, especially in Western and Eastern Africa, but also in Kazakh and Mong ...
, a position of the tongue during the pronunciation of a vowel, in phonetics
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Sternal retraction Labored respiration or labored breathing is an abnormal respiration characterized by evidence of increased effort to breathe, including the use of accessory muscles of respiration, stridor, grunting, or nasal flaring.
Classification
Labored breathi ...
, a symptom of respiratory distress in humans
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Retraction (kinesiology), an anatomical term of motion
See also
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Retractor (disambiguation)
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