Hard in theory, easy in practice: Why graph isomorphism algorithms seem to be so effective

Graphs are everywhere. In discrete mathematics, they are structures that show the connections between points, much like a ...
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$C^\ast$-Algebras Isomorphic after Tensoring

It is always true that whenever $\mathfrak{U}$ and $\mathfrak{B}$ are isomorphic $C^\ast$-algebras then $\mathfrak{M}_2 \otimes \mathfrak{U}$ and $\mathfrak{M}_2 ...