trivial abelian groups about book HOT 2 CLOSED

Not I. Although we should mention somewhere that this is the conventional
notation for trivial abelian groups, and that we're using it even in the
case of \pi_1 which is not a priori abelian.

On Mon, Mar 25, 2013 at 3:30 PM, Daniel R. Grayson <[email protected]

wrote:

Does anyone mind if the trivial homotopy groups of spheres are called 0
instead of 1?

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Reply to this email directly or view it on GitHubhttps://github.com//issues/21
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from book.

change made 85ce2b7

from book.