Algebra uses letters to represent unknown values. Unknown values are commonly represented by the letters x and y. There are several principles you need to know to be able to use algebraic notation.

Diagram 1: This diagram shows all squares on the chessboard identified by their coordinates. You would notice along the sides of the board there are letters and numbers. They are used to identify ...

WITH reference to Mr. Davison's letter in NATURE (vol. xxxiv. p. 571), I wish to point out that the subject of algebraic notation, not only for kinship, but for kinship and affinity, has been pretty ...