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## Recent Activity

Oct 21

new question: Prime numbers out of sequence by Rubens373

Oct 7

new question: Lorenz system by David Bankom

Oct 19

new correction: examples and OEIS sequences by fizzie

Oct 13

new correction: Define Galois correspondence by porton

Oct 7

new correction: Closure properties on languages: DCFL not closed under reversal by babou

new correction: DCFLs are not closed under reversal by petey

Oct 2

new correction: Many corrections by Smarandache

Sep 28

new question: how to contest an entry? by zorba

new question: simple question by parag

new question: Prime numbers out of sequence by Rubens373

Oct 7

new question: Lorenz system by David Bankom

Oct 19

new correction: examples and OEIS sequences by fizzie

Oct 13

new correction: Define Galois correspondence by porton

Oct 7

new correction: Closure properties on languages: DCFL not closed under reversal by babou

new correction: DCFLs are not closed under reversal by petey

Oct 2

new correction: Many corrections by Smarandache

Sep 28

new question: how to contest an entry? by zorba

new question: simple question by parag

## Comments

## 1/72 in Bloch's theorem

I'm curious about this 1/72 in this article on Bloch's theorem that is currently tagged as "unproven." (If it weren't for that literal, I wouldn't care less about it).

I thought maybe Wikipedia might say something about it, but apparently in physics there is something else called Bloch's theorem, which has to do with a model of particle physics known as Bloch waves. This was studied by Felix Bloch, who from the WP article about him one might deduce he didn't much care about math not applicable to physics.

Next I thought of looking at Mathworld (please put away the garlic and crosses). The MW article on topology cites a book by E. Bloch, A First Course in Geometric Topology and Differential Geometry. This E. Bloch is probably neither the composer Ernest Bloch nor the Marxist philosopher Ernst Bloch.

In short, this entry raises a lot of questions besides how to prove Bloch's theorem.

## Re: 1/72 in Bloch's theorem

The man you are looking for is Andre Bloch.

The Bloch from the 1/72 Bloch Theorem was Andre Bloch:

http://www-history.mcs.st-andrews.ac.uk/Biographies/Bloch.html

Bloch's life is one of the most shocking in the mathematical world, since most of his work was done in a mental institution where he lived for most of his life. He was psychologically damaged during World War I, and after coming back home from being in a hospital, he killed his brother, uncle and aunt.

Alvaro

## Why should the theorem be unproven?

I do not understand, why the theorem is as as unproven tagged. AndrÃƒÂ© Bloch supplied the proof.

Show here:

http://de.wikipedia.org/wiki/Satz_von_Bloch

## Re: Why should the theorem be unproven?

The unproven flag means that there is no proof available in PlanetMath. Really unproven things are labeled as "conjecture" or "problem".

## Settled oneself!

One should read always first the operating instruction.