Standard LaTeX typefaces

You can access a pair of special typefaces in LaTeX.

You can switch to script (calligraphic) letters by using the \cal command (note the ):

{\cal L}_{\text{int}} = e F^{3}_{\pi} r^{2}
  B^{0}(r,t) \epsilon \sin(\Omega t)
  \exp(\eta t),

Only uppercase letters are available in the \cal font.

You can switch to sans serif letters by using the \sf command (note the ):

R({\cal Q}-{\cal Q}_{0})
=R_{0} \exp\left(-\case1/2\Delta {\cal Q}
 \cdot{\sf M}\cdot\Delta{\cal Q}\right).
  \label{eq:rdef}

Both uppercase and lowercase letters are available with \sf.