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Question Number 91588 by  M±th+et+s last updated on 01/May/20

$$whatis{f}^{-1}forf\left(x\right)=\lfloor x\rfloor ??$$

Commented by mr W last updated on 01/May/20

$$x\to \lfloor x\rfloor isafunction,but$$$$\lfloor x\rfloor \to xisnotafunction,becausean$$$$elementofset\lfloor x\rfloor isnotassociated$$$$withexactlyoneelementofsetx.$$

Commented by MJS last updated on 01/May/20

$$f^{-1}\mathrm{is}\mathrm{no}\mathrm{function}$$$$\mathrm{same}\mathrm{problem}\mathrm{with}g\left(x\right)=c;c\in \mathbb{R}.g^{-1}\left(x\right)=?$$

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