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Nieco zwyk�ego tekstu \textbf{p�grubo}, \textit{a teraz kursyw�},
a~mo�e nawet \textsc{Kapitalikiem}. OK, wystarczy. Teraz matematyka
w~tek�cie $\sum_{\alpha\rightarrow\infty}\frac{a+1}{a-b^4}$
i~dalej ($f_m,f_n)=(f_{r_{k-1}}, f_{r_k})$. I~jeszcze $x^{4m}+y^{4m}=z^{4m}$,
gdzie $m\xgeq 1$. 
$\cal A + \cal G$. ${\varGamma}+\Phi$. Cyfry nautyczne
$\mathnormal{1967}$.

$$A,\dots,Z\quad a,\dots,z\quad \Gamma, \dots,\Omega\quad
 \varGamma, \dots, \varOmega\quad
 \alpha,\dots,\omega\quad \varg $$ 
\smallskip
$$\aleph_\alpha\times\aleph_\beta=\aleph_\beta\iff \alpha\le \beta$$
\smallskip
$$\forall \varepsilon >\alpha, \Gamma_\alpha\hookrightarrow
  \Gamma_\varepsilon$$
$$|x-a| < \delta \Rightarrow |f(x)-l| < \varepsilon$$
\smallskip
$$\underbrace {V \times \cdots \times V}_k \times
  \underbrace {V \times \cdots \times V}_l \rightarrow
  \underbrace {V \times \cdots \times V}_{k+l}$$
\smallskip
$$\{x\mid x \ne x\} = \emptyset\qquad (A\cap B)^\circ\subset A^\circ
  \cap B^\circ$$
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\begin{eqnarray*}
\omega &=& \nu+v(x,y)\,dx + w(x,y)\,dy+d\varPsi\\
  d\omega &=& d\nu+ \left(\frac{\partial w}{\partial x}-
  \frac{\partial v}{\partial y}\right) dx\wedge dy
\end{eqnarray*}
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$$\hat x+\widehat X+\widehat{xy}+\widehat{xyz}+\vec A$$
\smallskip
$$R_{ijkl}=-R_{jikl}=-R_{ijlk}=R_{klij}$$
\smallskip
$$f(x)=\cases{|x|&$x>a$\cr -|x|&$x\le a$\cr}$$
\smallskip
$$\int_{-\infty}^\infty e^{-x\cdot\,x}\,dx=\sqrt\pi$$
\smallskip
$$ X=\sum_i \xi^i \frac{\partial}{\partial x^i}+\sum_j
  x^j\frac{\partial}{\partial \dot x^j}$$
\smallskip
$$\prod_{j\ge0}\biggl(\sum_{k\ge0}a_{jk}z^k\biggr)
  =\sum_{n\ge0}z^n\,\Biggl(\sum_
     {\scriptstyle k_0,k_1,\ldots\ge0\atop
      \scriptstyle k_0+k_1+\cdots=n}
   a_{0k_0}a_{1k_1}\ldots\,\Biggr)$$
\smallskip
$$\int_0^\infty\frac{t-ib}{t^2+b^2}e^{iat}\,dt=e^{ab}E_1(ab),\qquad a,b>0$$

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