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Question

Let f:RR be the signum function defined as


f(x)=1,x>00,x=01,x<0


and g:RR be the greatest
integer function given by g(x)=[x], where [x] is greatest
integer less than or equal to x. Then, does fog and gof coincide in
(0,1]?

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Solution

f(x)=1,x>00,x=01,x<0any=[x]f(x)=f[(x)]=0whenx0,x11when x11when x<0f(x)=f(x)=1 x>00 x=01 x<0
in the interval [1,0]
fog(x)=gog(x) [1,0]

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