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Find the results of the following substitutions. Just give the answer and explain the reasons if the result is undefined:

a) (∀𝑥)(𝑓(𝑥) < 7)[𝑥 ≔ 7]

b) (∀𝑦)(𝑓(𝑥) < 7)[𝑥 ≔ 7]

There is nothing to substitute x to on both questions and will be therefore undefined?

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  • $\begingroup$ Please edit the question to credit the source where you are reading this. $\endgroup$ – D.W. Mar 21 at 17:33

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