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Question Number 125890 by geraldinebalasta last updated on 15/Dec/20

$$\left({\mathbb{Z}}^{+,\ast }\right)where{x}^{\ast }y=x-yforallx,y\in z^{+}.$$

Commented by talminator2856791 last updated on 15/Dec/20

$$\mathrm{what}\mathrm{is}\mathrm{the}\mathrm{question}?$$

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