* Re: pullback ...
@ 2007-03-07 2:09 Fred E.J. Linton
0 siblings, 0 replies; 2+ messages in thread
From: Fred E.J. Linton @ 2007-03-07 2:09 UTC (permalink / raw)
To: categories
Greetings!
As regards Peter <P.T.Johnstone@dpmms.cam.ac.uk> Johnstone's query,
> ... does anyone out there know who invented the
> terms "pullback" and "pushout"? ...,
while I can't speak directly to the question of who invented those
terms, I do recall that, in the late '50s already, fiber bundles
were being "pulled back" along maps to their base spaces. And I can
still hear the late Serge Lang, bless his soul, intoning "pooll-back"
and "poosh-out" in his characeristic French accent, in Columbia
courses and seminars from the late '50s and early '60s.
So the terms were pretty well established (and pull-back, anyway,
pretty well motivated), at least at Columbia, that early.
Cheers,
-- Fred
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: pullback ...
@ 2007-03-07 20:18 Dr. Cyrus F Nourani
0 siblings, 0 replies; 2+ messages in thread
From: Dr. Cyrus F Nourani @ 2007-03-07 20:18 UTC (permalink / raw)
To: categories
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