The sentence "nothing changes if nothing changes" is always true, but it is a "vacuous truth" because the antecedent "nothing changes" is always false because there is always at least one thing that changes and that's time. In other words, everything changes, regardless of what you do.
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The sentence "nothing changes if nothing changes" is always true, but it is a "vacuous truth" because the antecedent "nothing changes" is always false because there is always at least one thing that changes and that's time. In other words, everything changes, regardless of what you do.