I found a sentence as follows.


でない is the negation of である.

My question is that

Can we use either じゃない or ではない in addition to でない for the given sentence above?


Yes you can say:


But you cannot say:


Perhaps because は is already used after に.

Well, じゃ is explained as the "casual version of では", so I know it doesn't look consistent. I'm not sure, but maybe the "one wa per clause" rule can be loosened when じゃ is used?

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