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Esercizio 13

[1ZS]Provate 1 che in un anello:

  1. \(0 · x = 0\)

  2. \((-x)y = -(xy) = x(-y)\).

  3. \((- x)(- y) = xy\).

  4. \((- 1)x = -x\).

Soluzione 1

[299]

  1. [ 20 ] Prop. 1.16
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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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