Environments

• How Do I Reset a LaTeX \renewcommand?
  To undo a LaTeX \renewcommand, limit the redefinition to a group or save the original definition and restore it explicitly when you need it later.
• How to Create a Numbered Example Environment in LaTeX
  Create numbered examples in LaTeX with amsthm’s newtheorem command, optionally reset numbering by section, and cross-reference examples by label.
• How to Change the Margins in a LaTeX Environment
  Use the changepage package’s adjustwidth environment inside newenvironment to inset text locally, or use geometry to change page margins globally.