???????????????? f (x)?
...???????????????? f (x)? ???????? f (x) ?? x? ??????? g (x) ? f (x)???????? x???????????? ???? ??? 48 ???...
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??????? f (f (x))?x? - ??
...f (x)=h^ {-1} (g (h (x)))\\ ??? f (f (x)) = x f (f (x))=x . ? g (x) = 1 x ? h (x) = x 3 ??????? f (x) = (1 x 3) 1 3 . ?????????????????????? f (f (x)) = x ?????. 1????????? g (g (x)) = x ????? y = x ?? ?????? g (g (x))=x ?...
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???????? f (x) ???????? - ??
...?????? (0,0) ?????? 4 ????????? x^2+y^2=16 ??????? x^2+f^2 (x)=16 ? ?????????????????????????????????????????????????????????????????????? x ?? ......
https://www.zhihu.com/question/469970009
?????????? ??F?w? F?f???????????
...??? X (f) ?????????????? ?????????????????? ?????????????? \delta (t) ??????????? 1 ?????????????? ?????? 1 ????? f=0 ??????...
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???? f ? f (·) ? f (-) ?????? - ??
...???? f ? f (·) ? f (-) ?????? ???? [??] ?? [??] ??????????? ?? [??] ??????? ?????????????? ???????????? ?????? ???? ??? 36...
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?? - ?????????
...f?F????????function????.(??????f?Phi???????) p,q(??????????,????? ??) a,b,c,d(????)...
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???f?f?1?x???x? - ??
...????????????? y\Leftrightarrow x ??????????????? f ????????? f^ {-1} ????????? f ????????? f?f^ {-1}? ????????????????????????????? ????...
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???????? f (xy) = f (x)f (y) ????????? - ??
...???????? f (xy) = f (x)f (y) ????????? ??: ??x?y????????? f (xy)=f (x)f (y) ?????????????f (x)????? ???? ??? 77...
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°F??????????????_????
...°F???????????????????Fahrenheit temperature scale???F??????????????????????32???????212?????180?????????1??????????????...
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?????????f (x+y)=f (x)+f (y)??????f (x)??
...?????????f(x+y)=f(x)+f(y)??f(1)=1??????f(x)?????f(x)=x????????????...
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