pullback
English
Etymology
Noun
pullback (plural pullbacks)
- The act or result of pulling back; a withdrawal.
- (film) The act of drawing a camera back to broaden the visible scene.
- That which holds back, or causes to recede; a drawback; a hindrance.
- (architecture) The iron hook fixed to a casement to pull it shut, or to hold it partly open at a fixed point.
- (finance) A reduction in the price of a financial instrument after reaching a peak
- (sports) An attacking pass from the wing into a position further from the attacking goal line.
- 2010 December 29, Sam Sheringham, “Liverpool 0 - 1 Wolverhampton”, in BBC[1]:
- The Reds carved the first opening of the second period as Glen Johnson's pull-back found David Ngog but the Frenchman hooked wide from six yards.
- (differential geometry) The map between cotangent bundles of manifolds corresponding to a smooth map between smooth manifolds, which at each point is the dual map to the corresponding pushforward.
- (category theory) The limit of a cospan: a Cartesian square or “pullback square”.
- Synonyms: fiber product, fibre product, Cartesian square, pullback square
- Hyponyms: equalizer, equaliser
- (category theory) Within a Cartesian square (which has a pair of divergent morphisms and a pair of convergent morphisms) the divergent morphism which is directly opposite to a given one of the convergent morphisms, said to be “along” the convergent morphism which is between that pair of opposite morphisms. (The pullback is said to be “of” the given morphism.)
See also
Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for “pullback”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.)