Second Shift Theorem Homework: Why f(t-1) ≠ 0?

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goldfish9776

Homework Statement

why the f(t-1) isn't = 1-1 = 0 ? since f(t) = 1 , a=1

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mfb

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The function is 1 for every argument value. It does not matter whether you call the argument t, t-1 or q.