ALGEBRA AND NUMBER THEORY

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Across
  1. 1. a×(b×c)=(a×b)×c - what property?
  2. 3. it is a group under both addition and multiplication
  3. 4. it is a group under addition and satisfies the properties
  4. 5. a mapping from a group G to G'
Down
  1. 2. it is also called a commutative group