Question: Let be an alphabet. For any strings u,v , prove that (a)|uv|=|u|+|v|. (b)|uv|=|vu|.

Let Σ be an alphabet.  For any strings

u,v ∈Σ, prove that

(a)|uv|=|u|+|v|.

(b)|uv|=|vu|.

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