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Show that if f1 and f2 are one-one maps ...

Show that if `f_1 and f_2` are one-one maps from r to R, then the product. `f_1 xx f_2: R rarr R` defined by `(f_1xx f_2) (x) = f_1 (x) xx f_2(x)` need not be one-one.

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MODERN PUBLICATION-RELATIONS AND FUNCTION-EXAMPLE
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