\startformula
  \widehat{bcd} \ \widetilde{efg} \ \dot A \ \dot R  \ {\bi\dot A \check t} 
  \  \check{\cal A} \check{\cal a} \ {\mathbf \acute \imath}
\stopformula

%Angle brackets:
\startformula
  \langle a \rangle \left\langle \frac{a}{b} \right\rangle
  \left\langle \frac{\frac{a}{b}}{c} \right\rangle
\stopformula

%Big operators:
\startformula
  (x + a)^n = \sum_{k=0}^n \int_{t_1}^{t_2} {n \choose k} x^k a^{n-k}f(x)\,dx
\stopformula

%Logical operators
\startformula
 \def\buildrel#1\below#2{\mathrel{\mathop{\kern0mm#2}\limits_{#1}}}
 \bigcup_a^b \bigcap_c^d E {\buildrel ab \below \rightarrow} F' {\buildrel cd \below \Rightarrow} G
\stopformula

%%Horizontal brackets:
\startformula
 \underbrace{\overbracket{aaaaaaa}}_{\rm Siedém}
  \underbrace{\overparent{aaaaa}}_{\rm pięć}
\stopformula

%Squares:
\startformula
 \sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{2}}}}}} =
 \frac{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{\sqrt{2}}}}}}}}}{\frac{2}{3}}
\stopformula

%Cardinal numbers
\startformula
 \aleph_{0}<2^{\aleph_0}<2^{2^{\aleph_0}}
\stopformula

%Powers
\startformula
x^{\alpha} e^{\beta x^{\gamma} e^{\delta x^{\epsilon}}}
\stopformula

%Integrals
\startformula
 \oint_C{\mathbf F}\cdot d{\mathbf r}=\int_S{\mathbf\nabla}\times{\mathbf F}\cdot d{\mathbf S}\qquad
 \oint_C\vec{A}\cdot\vec{dr}=\iint_S(\nabla\times\vec{A})\,\vec{dS}
\stopformula

%Sum
\startformula
 (1+x)^n=1+\frac{nx}{1!}+\frac{n(n-1)x^2}{2!}+\cdots
\stopformula

%Equations
\startformula
\startmathalignment
 \int_{-\infty}^\infty e^{-x^2}dx \NC =\NC  \left[\int_{-\infty}^\infty e^{-x^2}dx
  \int_{-\infty}^\infty e^{-y^2}dy\right]^{1/2} \NR
 \NC =\NC \left[\int_{0}^{2\pi} \int_0^\infty  e^{-r^2}r\,dr\,d\theta\right]^{1/2}\NR
 \NC =\NC \left[\pi\int_{0}^\infty e^{-u}du\right]^{1/2}\NR
 \NC =\NC \sqrt{\pi}
\stopmathalignment
\stopformula

\endinput