Question: Show that the signum function f: R R given by onto. [1, if x > 0 f(x) = {0, if x = 0 -1,

Show that the signum function f: R R given by onto. [1,

Show that the signum function f: R R given by onto. [1, if x > 0 f(x) = {0, if x = 0 -1, if x < 0 is neither one-one nor

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