LaTeX provides a number of different paragraph-making environments. Each environment begins and ends in the same manner.
\begin{environment-name} .... .... \end{environment-name}Blank lines before the
\begin{}
or after the \end{}
cause a
paragraph break before or after the environment.
Blank lines after the \begin{}
or before the \end{}
are
ignored.
All declarations have an environment of the same name. However, the reverse does not always work.
For example,
{\abstract Abstract text ... .}
may not give correct paragraph
breaks.