What is this expression?

Question

I saw this nice relief on the University of Warsaw's library building, but I'm left wondering what the line beneath $\pi$ and above Collatz is saying. I'm not familiar with the arrow notation.

Can anyone identify it or give a reference for it?

enter image description here

That is the long exact sequence of homology groups of a pair $(X,A)$ of topological spaces. — Stefan Hamcke, Jul 28 '13 at 15:54
Looks like Mayer-Vietoris http://en.wikipedia.org/wiki/Mayer%E2%80%93Vietoris_sequence to me — BlackAdder, Jul 28 '13 at 15:55

score 2 · Accepted Answer · answered Jul 28 '13 at 15:56

2

It is the long exact sequence of homology groups for a pair of spaces $(X,A)$.

answered Jul 28 '13 at 15:56

Zev Chonoles

129,973

What is this expression?

1 Answers1