#### Mathematical English Usage - a Dictionary

##### by Jerzy Trzeciak

## interchange

[*see also*: exchange

**1**

To justify the interchange of summation and integration, consider......

The interchange in the order of integration was legitimate, since......

**2**

It follows, by interchanging the roles of X and Y, that......

The lower limit is defined analogously: simply interchange sup and inf in
(1).

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