#### Mathematical English Usage - a Dictionary

##### by Jerzy Trzeciak

## coordinate

There are N vertices of the 24-cube which have a 1 in the
ith coordinate and a total of five 1s.

We adopt the convention that the first coordinate i increases as one goes downwards,
and the second coordinate j increases as one goes from left to right.

Now X can be taken as coordinate variable on M.

This explains why we chose 9 rather than, say, 1 for the second
coordinate.

Keep only those vertices whose coordinates sum to 4.

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