Timeline for Kernel and cokernel
Current License: CC BY-SA 2.5
2 events
| when toggle format | what | by | license | comment | |
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| Aug 8, 2010 at 15:38 | comment | added | BCnrd | Exactement. There is a natural commutative square (for any kernel & coker one chooses), using m along along top row, ker(coker(m)) along bottom, and specific vertical isoms. It is sloppy when people say something is unique "up to isomorphism", omitting canonicity and/or uniqueness of the isom (which underlies how the construction is actually used). In this sense, tetrapharmakon's comment is missing the canonicity aspect of the isomorphism, needed to avoid Amadeus' confusion. The end of Sasha's comment leads to Bill Clinton's contribution to math, on what the meaning of "is" is. :) | |
| Aug 8, 2010 at 10:39 | history | answered | Roman Fedorov | CC BY-SA 2.5 |