# Difference between revisions of "The order of terms matters even when they commute"

From Why start at x, y, z

(The order of factors in a term follows apparently arbitrary conventions.) |
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When writing a term that consists of several factors, the conventions regarding their order appear arbitrary. It is usual to write: | When writing a term that consists of several factors, the conventions regarding their order appear arbitrary. It is usual to write: | ||

* | * \(xy\) and \(yx\) in either order; | ||

* | * \(5t\) but not \(t5\) (to avoid confusion with \(t_5\) or \(t^5\)); | ||

* | * \(x\sqrt{2}\) but not \(\sqrt{2}x\) (to avoid confusion with \(\sqrt{2x}\)). | ||

* | * \(\sqrt{2}\sin x\) but not \(\sin x \sqrt{2}\) (to avoid confusion with \(\sin \left(x\sqrt{2}\right)\)). |

## Revision as of 08:42, 15 July 2021

When writing a term that consists of several factors, the conventions regarding their order appear arbitrary. It is usual to write:

- \(xy\) and \(yx\) in either order;
- \(5t\) but not \(t5\) (to avoid confusion with \(t_5\) or \(t^5\));
- \(x\sqrt{2}\) but not \(\sqrt{2}x\) (to avoid confusion with \(\sqrt{2x}\)).
- \(\sqrt{2}\sin x\) but not \(\sin x \sqrt{2}\) (to avoid confusion with \(\sin \left(x\sqrt{2}\right)\)).