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## Main Question or Discussion Point

When dealing with real valued functions (one output for now) of more than one real variable, can the usual rules from R --> R be generalised in the natural way? Specifically the sum, product, quotient and composite rules. Any pathological cases?

Also I was also wondering if there are any tools analogous to L'Hopital lying around anywhere.

Also I was also wondering if there are any tools analogous to L'Hopital lying around anywhere.