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Word: pullback (lookup usage) (lookup stats)

Noun:

category theory Given a pair of arrows $f:Y
ightarrow X$ and $g: Z
ightarrow X$ with a common codomain, ''X'', their '''pullback''' is a pair of arrows $u:P
ightarrow Y$ and $v:P
ightarrow Z$ with common domain, ''P'', such that the equation $fcirc u = gcirc v$ is satisfied, and for which there is the ''universal property'' that for any other object ''W'' for which there are also arrows $m: W
ightarrow Y$ , $n: W
ightarrow Z$ ; there is a unique arrow $k: W
ightarrow P$ such that $ucirc k = m$ and $vcirc k = n$ .
finance A reduction in the price of a financial instrument after reaching a peak
The act or result of pulling back; a withdrawal

Source: Wiktionary | Src Info »