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when toggle format what by license comment
May 9, 2020 at 16:06 comment added PJORR Thanks a lot! Yes, it should be f(x') rather than h(x'), I edited the question to correct this mistake.
May 9, 2020 at 15:26 vote accept PJORR
May 8, 2020 at 20:58 history answered Iosif Pinelis CC BY-SA 4.0