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Let C(X, G) be the group of continuous functions from a topological space X into a topological group G with pointwise multiplication as the composition law, endowed with the uniform convergence topology. To what extent does the group structure of C(X, G) determine the topology of X? More generally, when does the existence of a group homomorphism H between the groups C(X, G) and C(Y, G) implies that there is a continuous map h of Y into X such that H is canonically represented by h? We prove that, for any topological group G and compact spaces X and Y , every non-vanishing C-isomorphism (defined below) H of C(X, G) into C(Y, G) is automatically continuous and can be canonically represented by a continuous map h of Y into X. Some applications to specific groups and examples are given in the paper.

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