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Homology is a general way of associating a sequence of algebraic objects such as abelian groups or modules to other mathematical objects such as topological spaces.
5
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Accepted
Amending flawed "proof" that homology groups are zero
The reason is that $2\cdot 5\cdot 7=70$ is adjacent to all those 6 numbers and therefore cones this sphere off in $\mathrm{Cl}(G_{77})$, trivializing it in homology. …