Today I Learned

Some of the things I've learned every day since Oct 10, 2016

92: Order (Groups)

The order of a group G, often denoted |G|, is the cardinality of its underlying set. If the order is finite, then G is called a finite group, and likewise for infinite order.

An example of a group with finite order would be the dihedral group D_n for some n. An example of one with infinite order would be the group of \mathbb{Z} together with addition.

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