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Esercizio 8

[1ZR]Provate 1 che in un gruppo:

  1. Se x+y=x+z allora y=z.

  2. Se x+y=x allora y=0.

  3. Se x+y=0 allora y=−x.

  4. −(−x)=x.

  1. [ 16 ] Prop. 1.14
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Authors: "Mennucci , Andrea C. G." .
Bibliography
  • [26] Walter Rudin. Principles of Mathematical Analysis. McGraw–Hill, New York, 3rd edition, 1964.

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