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Which is the correct preposition to follow ‘proof’ in this context:

Most student enroll at unuversity with the aim of getting the degree required for a particular job. One good proof for/ of this is a recent survey conducted in some Egyptian universities......

Should I write ‘for’ or ‘of’?

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    Idiomatically, of is very much the preferred preposition here, as shown by that NGram. But it's really no more than a "conventionally established" usage - there's no particular reason (logical or semantic) for proof of being the dominant form.
    – FumbleFingers
    Sep 2, 2018 at 13:44
  • The (low) usage of "proof for" may be coming from different usage patterns. For example (in maths) "one method of proof for this class of problems is to ..." is normal, but "one method of proof of this class of problems ..." is ungrammatical.
    – alephzero
    Sep 2, 2018 at 20:30

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Either are acceptable depending on how one uses them

Proof Of Concept

is an established term in business and elsewhere to show evidence that something can be done.

It is never

Proof for Concept

Consider

The proof for the viability of our proposal was demonstrated by the Proof of Concept.

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