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Using character theory, any group of order 4$4$ is abelian since the only way to write 4$4$ as a sum of squares is 4 = 1^2 + 1^2 + 1^2 + 1^2$4 = 1^2 + 1^2 + 1^2 + 1^2$.
Using character theory, any group of order 4 is abelian since the only way to write 4 as a sum of squares is 4 = 1^2 + 1^2 + 1^2 + 1^2.
Using character theory, any group of order $4$ is abelian since the only way to write $4$ as a sum of squares is $4 = 1^2 + 1^2 + 1^2 + 1^2$.
