____________
A paragraph is ended by one or more completely blank lines -- lines not
containing even a %
. A blank line should not appear where a new
paragraph cannot be started, such as in math mode or in the argument of
a sectioning command.
\indent
This produces a horizontal space whose width equals the width of the paragraph indentation. It is used to add paragraph indentation where it would otherwise be suppressed.
\noindent
When used at the beginning of the paragraph, it suppresses the paragraph indentation. It has no effect when used in the middle of a paragraph.
\par
Equivalent to a blank line; often used to make command or environment definitions easier to read.