#### Mathematical English Usage - a Dictionary

##### by Jerzy Trzeciak

## call

[*see also*: name, designate, term, appeal, invoke, require

A set D is called a * phase diagram* if...... [No comma before * if* here.]

Call a set a * phase diagram* if......

The lemma motivates our calling R a generalized Picard group.

This corollary calls for some explanation and comment.

Adding E to both sides of (1), we can call upon (2) to obtain (3).

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