\sin x + \ln y +\operatorname{sgn} z

sin x + ln y + sgn z

s_k \equiv 0 \pmod{m}

\nabla \partial x dx \dot x \ddot y

\forall x \not\in \varnothing \subseteq A \subset B \cap C \cup \exists \{x,y\} \times C

p \land \bar{q} \to p\lor \lnot q

\sqrt{2}\approx 1.4

\sqrt[n]{x}

\sim \approx \simeq \cong \doteq \overset{\underset{\mathrm{def}}{}}{=}

\le < \ll \gg \ge > \equiv \not\equiv \ne \mbox{or} \neq \propto

\geqq \geqslant \eqslantgtr \gtrsim \gtrapprox

\triangle \angle \perp \| 45^\circ

\leftarrow \rightarrow \leftrightarrow
\longleftarrow \longrightarrow
\mapsto \longmapsto
\nearrow \searrow \swarrow \nwarrow
\uparrow \downarrow \updownarrow

\Leftarrow \Rightarrow \Leftrightarrow
\Longleftarrow \Longrightarrow \Longleftrightarrow
\Uparrow \Downarrow \Updownarrow

\oplus \otimes \pm \mp \hbar \dagger \ddagger
 \star \circ \cdot \times \bullet \infty