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### Math Environments submenu

| math | <OPT F5> |
| displaymath | <SHF OPT F5> |
| equation | <CTL OPT F5> |
| eqnarray`*` | <SHF OPT F6> |
| eqnarray | <CTL OPT F6> |
| array | <OPT F6> |
| general | <OPT F12> |

Besides the `math` and `displaymath` environments discussed in section 2.1.4, other multi-line math environments (`equation`, `array`, `eqnarray`, and `eqnarray*`) are also available. Each is mutually exclusive (that is, one may not be nested inside the other) except for the `array` environment which must be nested inside some other math environment. (It took me a long time to come to grips with this apparent anomaly). There's also a general environment command, which is exactly the same command found on the Text Style submenu.