\[ x_j = \sum_{k=0}^{N-1} z_k e^{-2\pi i j k / N} \]$ r=a+b\theta $$ \lim_{n \to \infty} \sum_{k=1}^n \frac{1}{k^2} = \frac{\pi^2}{6} $ \begin{displaymath} \lim_{n \to \infty} \sum_{k=1}^n \frac{1}{k^2} = \frac{\pi^2}{6} \end{displaymath} $ \Delta $$ \delta $\[ \textrm{es mejor usar} \] \[ \int\!\!\!\int_{D} g(x,y) \, dx dy \] \[ \textrm{en lugar de} \] \[ \int\int_{D} g(x,y) dx dy \] \[ \textrm{Sea }f: \Re \rightarrow \Re \] \[ \textrm{Se dice que } f \textrm{ es continua en } \mathbf{x_0} \textrm{ si y sólo si } \] \[ \forall \epsilon>0\textrm{, } \exists \delta>0 \textrm{ tal que si } x \in [x_0-\delta, x_0+\delta] \] \[ \Longrightarrow f(x) \in [f(x_0 - \delta), f(x_0 + \delta)] \] \begin{displaymath} 1 + \left( \frac{1}{ 1-x^{2} } \right) ^3 \end{displaymath} $\Big( (x+1) (x-1) \Big) ^{2}$ $\big(\Big(\bigg(\Bigg($ $\big\}\Big\}\bigg\}\Bigg\}$ $\big\|\Big\|\bigg\|\Bigg\|$ $ \pi $\( \overline{X} \)$ a, b, \in \Re $$\theta$\[ \int^0_1f(x) \]\( e^{x _1 ^2} \)$ \cdots $$ \ddots $$ \vdots $$ \ldots $$ \overbrace{texto} $$ \underbrace{texto} $$ \overline{texto} $$ \underline{texto} $$ \sqrt[3]{x} $$\hat{a}$$\check{a}$$\tilde{a}$$\acute{a}$$\grave{a}$$\dot{a}$$\ddot{a}$$\breve{a}$$\bar{a}$$\vec{a}$$\widehat{A}$$\widetilde{A}$$\alpha$$\theta$$o$$\upsilon$$\beta$$\vartheta$$\pi$$\phi$$\gamma$$\iota$$\varpi$$\varphi$$\delta$$\kappa$$\rho$$\chi$$\epsilon$$\lambda$$\varrho$$\psi$$\varepsilon$$\mu$$\sigma$$\omega$$\zeta$$\nu$$\varsigma$$\eta$$\xi$$\tau$$\Gamma$$\Lambda$$\Sigma$$\Psi$$\Delta$$\Xi$$\Upsilon$$\Omega$$\Theta$$\Pi$$\Phi$$\in$$\notin$$<$$>$$=$$\equiv$$\geq$$\leq$$\ll$$\gg$$\doteq$$\prec$$\succ$$\sim$$\preceq$$\succeq$$\simeq$$\subset$$\supset$$\approx$$\subseteq$$\supseteq$$\cong$$\sqsubseteq$$\sqsupseteq$$\bowtie$$\in$$\ni$$\propto$$\vdash$$\dashv$$\models$$\mid$$\parallel$$\perp$$\smile$$\frown$$\asymp$$:$$\notin$$\neq$$\leftarrow$$\longleftarrow$$\uparrow$$ \rightarrow$$\longrightarrow$$\downarrow$$\leftrightarrow$$\longleftrightarrow$$\updownarrow$$\Leftarrow$$\Longleftarrow$$\Uparrow$$\Rightarrow$$\Longrightarrow$$\Leftrightarrow$$\Leftrightarrow$$\Longleftrightarrow$$\Updownarrow$$\mapsto$$\longmapsto$$\nearrow$$\hookleftarrow$$\hookrightarrow$$\searrow$$\leftharpoonup$$\rightharpoonup$$\swarrow$$\leftharpoondown$$\rightharpoondown$$\nwarrow$$\rightleftharpoons$$\iff$$+$$-$$\pm$$\mp$$\triangleleft$$\cdot$$\div$$\triangleright$$\times$$\setminus$$\star$$\cup$$\cap$$\ast$$\sqcup$$\sqcap$$\circ$$\vee$$ \wedge$$\bullet$$\oplus$$\ominus$$\diamond$$\odot$$\oslash$$\uplus$$\otimes$$\bigcirc$$\amalg$$\bigtriangleup$$\bigtriangledown$$\dagger$$\ddagger$$\wr$$ \sum$$\bigcup$$\bigvee$$\bigoplus$$\prod$$\bigcap$$\bigwedge$$\bigotimes$$\coprod$$\bigsqcup$$\bigodot$$\int$$\oint$$\biguplus$$ ($$)$$\uparrow$$\Uparrow$$\lbrack$$\rbrack$$\downarrow$$\Downarrow$$\lbrace$$\rbrace$$\updownarrow$$\Updownarrow$$\langle$$\rangle$$\vert$$\Vert$$\lfloor$$\rfloor$$\lceil$$\rceil$$/$$\backslash$$\lgroup$$\rgroup$$\lmoustache$$\rmoustache$$\arrowvert$$\Arrowvert$$\bracevert$$\dots$$\cdots$$\vdots$$\ddots$$\hbar$$\imath$$\jmath$$ \ell$$\Re$$\Im$$\aleph$$ \wp$$forall$$\exists$$\partial$$'$$\prime$$ \emptyset$$\infty$$\nabla$$\triangle$$\bot$$\top$$\angle$$\surd$$\diamondsuit$$\heartsuit$$\clubsuit$$\spadesuit$$ \neg$$ \flat$$ \natural$$ \sharp$ .