I asked a question about second duals of vector spaces on MathOverflow.
Thank you for letting me know if you have any idea.
Iterated Dual Vector Spaces
March 29, 2014I’ve posted a question on Mathematics Stack Exchange about iterated dual vector spaces.
Any idea? Thanks in advance!
Selected Texts
June 26, 2013I put together four short texts I have written.
New version of my text about “Categories and Sheaves”
April 29, 2013Function of a Matrix
June 15, 2012New version of Function of a Matrix.
Two Tiny Texts
April 28, 2012Here are two new tiny texts:
Yoneda’s Lemma
Gödel
Function of a Matrix
March 27, 2012Categories and Sheaves by Masaki Kashiwara and Pierre Schapira (2)
March 22, 2012On page 24, line 4, one reads
Hom_C(X,Y) \in U for all X,Y \in C, …
This is incorrect (I think).
* Google Books Preview
* Amazon Preview
PS. This has already been pointed out by Joseph Oesterlé:
Categories and Sheaves by Kashiwara and Schapira.
February 25, 2012Started reading Categories and Sheaves, by Masaki Kashiwara and Pierre Schapira.
Amazing!!!
Links: Google Books — Amazon.
Two Excerpts from “Set Theory and the Continuum Hypothesis” by Paul Cohen
August 6, 2011It should be emphasized that these functions are “real” mathematical objects and not objects of any formal system … [Section I.7, p. 26.]
The theorems of the previous section are not results about what can be proved in particular axiom systems; they are absolute statements about functions. [Section I.9, p. 39.]
Pierre-Yves Gaillard's Weblog 