Why does "by an elementary valid argument" exist where the sentence is not passive voice?
How can I understand "by an elementary valid argument"?

We can define a formal proof, that a given argument is valid as a sequence of statements each of which follows from preceding statements of the sequence by an elementary valid argument.

Question

Why does "by an elementary valid argument" exist where the sentence is not passive voice?
How can I understand  "by an elementary valid argument"?

We can define a formal proof, that a given argument is valid as a sequence of statements each of which follows from preceding statements of the sequence by an elementary valid argument.

Answer

It exists because it is the *always true thing* that is linking one statement to the next, i.e. each statement connects from the preceding statement through this basic (=elementary) valid (=true) argument.

解答 · 1

還沒找到你要的答案嗎？

Don’t miss out on the opportunity to learn a language from the comfort of your own home. Browse our selection of experienced language tutors and enroll in your first lesson now!