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This tag is used if a reference is needed in a paper or textbook on a specific result.
2
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reference request: variations on Pascal's triangle
Define Pascal's triangle as follows: it is an array $(T_{m,n})_{m, n \in \mathbf{Z}}$ of integers, satisfying
if $m<0$, then $T_{m,n}=0$.
$T_{0,0}=1$ and if $n \neq 0$, then $T_{0,n}=0$.
if $m>0$, t …
6
votes
Accepted
Hopf algebra kernels vs. algebra kernels
The paper "A correspondence between bi-ideals and sub-Hopf algebras in cocommutative Hopf algebras" by K. Newman (J. Algebra, Volume 36, Issue 1, July 1975, Pages 1-15) may answer your question.
See …
8
votes
Euclid with Birkhoff
If you're willing to use an unpublished manuscript, from the little I've looked at it, this book by Matthew Harvey looks pretty good. However, he uses Hilbert's axioms rather than Birkhoff's. Jack L …
9
votes
$Sq^1$ cohomology of spaces
Several people have addressed question 1 (Torsten Ekedahl and Neil Strickland). Question 2 is interesting, but I don't have a good answer for it. For question 3, as Sean Tilson points out, this is a …
7
votes
Reference request: Spec A_* is the automorphism group of the additive formal group law
If you're looking for a reference in print, it's in Ravenel's book Complex Cobordism and Stable Homotopy Groups of Spheres. See the comments after the proof of Theorem A2.2.18. (This book is availab …
15
votes
Accepted
Massey Products vs. $A_\infty$-Structures
When $n=3$, this is in Stasheff's H-spaces from a homotopy point of view, Chapter 12. For general $n$, it is in a paper of mine with Lu, Wu, and Zhang, "$A_\infty$-structures in Ext algebras, J. Pure …
5
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1
answer
301
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Discriminants of Clifford algebras
I have a Clifford algebra defined over a field of characteristic not equal to $2$. Is there a formula for its discriminant in terms of the corresponding symmetric bilinear form (or in terms of its qua …