#### Mathematical English Usage - a Dictionary

##### by Jerzy Trzeciak

## sum

**1**

Hence F is the sum of an injective module and
a projective module.

Here p_{2}(r) is the sum of the squares of the divisors of r.

Every F is a sum of irreducible elements.

Here F is the sum of a collection of......

The sum is taken over all a dividing p.

**2**

[*see also*: add] Summing (2) and (3), we obtain......

Keep only those vertices whose coordinates sum to 4. [= add up to 4]

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