Pullback vs Pulldown - What's the difference?

As nouns the difference between pullback and pulldown

is that pullback is the act or result of pulling back; a withdrawal while pulldown is alternative form of lang=en.

pullback

English

(wikipedia pullback)

Noun

(en noun)

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

(category theory) Given a pair of morphisms

f:X\rightarrow Z

and

g: Y\rightarrow Z

with a common codomain, Z'', their pullback is a pair of morphisms $p_1:P\rightarrow X$ and $p_2:P\rightarrow Y$ as well as their common domain, ''P'', such that the equation $f\circ p_1 = g\circ p_2$ is satisfied, and for which there is the ''universal property'' that for any other object ''Q for which there are also morphisms

q_1: Q\rightarrow X

q_2: Q\rightarrow Y

; there is a unique morphism

u: Q\rightarrow P

such that

p_1\circ u = q_1

and

p_2 \circ u = q_2

Antonyms

* (category theory) pushout (Webster 1913)

pulldown

English

Noun

(en noun)

(juggling) A trick done with rings where each ring is pulled down over the head instead of being caught and held in the hand.

* Luke Holman, Hardest, most tech trick on the net, May 12 2004 via Google Groups

For example, the 11 ring pulldown didn't stick in my head because I don't really juggle rings, and I have no conception of how hard it is.