magic square

The glossary is being gradually proof checked, but currently has many typos and misspellings.

A magic square is a square grid of numbers, typically consecutuve, where each row, column and sometimes diagnonal add up to the same number.

Used in Chap. 4: pages 36, 37, 39, 40, 42, 47, 53, 54; Chap. 11: page 148

A 3x3 magic square