I asked a question about second duals of vector spaces on MathOverflow.

Thank you for letting me know if you have any idea.

Mathematics

I asked a question about second duals of vector spaces on MathOverflow.

Thank you for letting me know if you have any idea.

I’ve posted a question on Mathematics Stack Exchange about iterated dual vector spaces.

Any idea? Thanks in advance!

I put together four short texts I have written.

New version of Function of a Matrix.

Here are two new tiny texts:

On 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:

Started reading **Categories and Sheaves**, by Masaki Kashiwara and Pierre Schapira.

Amazing!!!

Links: Google Books — Amazon.

It 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.]