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Oct 10, 2019 at 14:03 comment added gregarki khayal This exactly solves my question. Just as a reference, we can find similar argument (for a bit more general case) in Peter D. Lax's paper (Journal of Mathematical Physics 5, 1964).
Oct 10, 2019 at 13:58 vote accept gregarki khayal
Oct 9, 2019 at 18:28 history edited Willie Wong CC BY-SA 4.0
added 487 characters in body
Oct 9, 2019 at 15:18 history answered Willie Wong CC BY-SA 4.0