WORDPLAY

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Across
  1. 2. A Scalar value which is associated with square matrix
  2. 4. .
  3. 6. Which is officially known as International Medal for Outstanding Discoveries in Mathematics?
  4. 7. 1/2×diagonal×(sum of the height of two
Down
  1. 1. {1,1,2, 6, 24, 120, 720, 5040, 40320...}
  2. 3. Who proved that the value of π lies between 3 + 1/7 (approx. 3.1429) and 3 + 10/71 (approx. 3.1408)?
  3. 5. .