The causality of a system was defined in Section 2.2.4. From this definition, show that, for an LTI system, causality implies that the impulse response h[n] is zero forn < 0. One approach is to show that if h[n] is not zero for n < 0, then the system cannot be causal. Show also that if the impulse response is zero for n < 0, then the system will necessarily be causal.
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