The boldmath declaration switches to a bold math italic font. Spacing in math mode. Click it and then select Matrix n x m.
Greek letters are commonly used in mathematics and they are very easy to type in math mode.
Choosing a LaTeX Compiler. C the sansmath environment is augmented so that bm will typeset its argument the way that mathsfbf does. This causes letters numbers and most symbols used in math mode to be set in a bold type. Creating your first LaTeX document.