Isomorphisms between members of infinite families of mathematical objects (finite simple groups, Lie groups etc), that are not examples of a pattern of such isomorphisms.
Questions tagged [exceptional-isomorphisms]
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Questions on Isomorphisims
$\mathbb{N}$, the set of natural numbers is set theoretically isomorphic to $\mathbb{Z}$,the set of integer.
But my questions is why it is isomorphic to $\mathbb{Q}$, the set of rational numbers but not isomorphic to $\mathbb{R}$, the set of real…
Austin20
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