A Lower Bound for the Delta-Nielson Number.

A Lower Bound for the Delta-Nielson Number.

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This Paper is concerned with the number of solutions of three kinds of equations: Let f and g be maps of a space X into a space H, and let H be a map of X into itself, and let y be in Y. The equations studied are: f(x)=g(x); f(x)=y; and h(x)=x. In ...