Kerodon

$\Newextarrow{\xRightarrow}{5,5}{0x21D2}$ $\newcommand\empty{}$
$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$

Comments on Subsection 3.4.3

Go back to the page of Subsection 3.4.3.

Comment #1023 by Xiaowen Hu on

Is Exercise 3.4.3.1 correct? Take A=B=C=D=point, and arbitrarily, the resulted diagram is not a pushout of sets. But it is probably correct for groups.

Comment #1030 by Kerodon on

Looks fine to me.

Comment #1034 by Xiaowen Hu on

Yes, it is right. I'm sorry.

Comment #1325 by Nick Kuhn on

In the setup of Theorem 3.4.3.3, is the top face required to commute?

Comment #1329 by Kerodon on

Yes, the cubical diagram is assumed commutative.

There are also:

  • 5 comment(s) on Chapter 3: Kan Complexes
  • 4 comment(s) on Section 3.4: Homotopy Pullback and Homotopy Pushout Squares

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