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?
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4$\begingroup$ That is the long exact sequence of homology groups of a pair $(X,A)$ of topological spaces. $\endgroup$– Stefan HamckeCommented Jul 28, 2013 at 15:54
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$\begingroup$ Looks like Mayer-Vietoris en.wikipedia.org/wiki/Mayer%E2%80%93Vietoris_sequence to me $\endgroup$– BlackAdderCommented Jul 28, 2013 at 15:55
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1 Answer
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It is the long exact sequence of homology groups for a pair of spaces $(X,A)$.
answered Jul 28, 2013 at 15:56