Timeline for Symmetric polynoms are Hopf algebra ? What for one needs co-product ?
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| Jan 19, 2012 at 16:44 | comment | added | Alexander Chervov | Thank for Yours answer. I also seen many papers talking about this. But COhomology is an algebra - there is NO co-product (unless we have a (semi)-group structure). What people saying here that co-product also appears in the limit n->infity. Grassmanians is certain limits are BU, which is at least H-space as far as I remember - so there will be co-product... But if it is the way to see it - I would not say it is easy... | |
| Jan 18, 2012 at 19:03 | history | answered | Alexander Woo | CC BY-SA 3.0 |