7.12.9 Parentheses

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Parentheses are defined thus:

Parentheses are characteristic in that they simply disappear during macro expansion. A number of constructs have a similar behavior:

Those two constructs also disappear during macro expansion, but they affect typography in that they force a newline where they occur. The only difference between the 'newline' and the 'tight newline' constructs are that the newline construct has very high charge and tight newline has very low charge. Which one to use depends on context. Use the one which does not ruin the structure of the term it occurs in.

Talking about parentheses, the following constructs also behave more or less like parentheses. They all affect their parameter somehow. The constructs are presented using their lgs source rather than their rendering since many of them are invisible when rendered.

show x end show

Renders x using the tex show aspect.

!x

Same as show x end show but shorter.

macro show x end show

Similar to show x end show but also macro expands like parentheses so that it disappears in the expansion of the page.

hide x end hide

Hides x from harvesting. Thus, all definitions that appear inside x are ignored.

hiding show x end show

Renders the constructs in x using the tex show aspect, protects x from macro expansion, and and hides x from harvesting.

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