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References to 'homotopy invariance'
1.
de Rham cohomology
by
pbruin
2.
example of de Rham cohomology
by
pbruin
3.
fundamental groupoid
by
CWoo
4.
homology
by
mathcam
5.
homotopy category
by
bci1
6.
proof of Poincar\'e lemma
by
pbruin