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\R \leftarrow
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\N \longleftarrow
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\Z \leftrightarrow
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\mathbb{C} \Leftarrow
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\mathbb{A} \Longleftarrow
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\mathfrak{S} \Leftrightarrow
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a_{b_c^d}^{e_f^g}
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\lim_{n \to +\infty} f(x) = \ell
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\frac{p^{\alpha}}{q^{\aleph+\aleph_0}}
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\sum_{k=0}^n \alpha_n^2
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\product_{n=1}^{\infty}
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\int_{r \in \R_+} \int_{\theta=0}^{2 \pi} \frac{e^{i \theta}}{\sigma^r} \, r \, d \theta dr
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\in \ni \not\in \not\ni
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\subset \supset \not\subset \not\supset
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\subseteq \supseteq \not\subseteq \not\supseteq
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\forall \exists \cup \cap
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= \equiv < > \leq \geq
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\sim \simeq \cong \approx \wedge \vee
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