Relations and their Negations
< < > > = = \leq \leq \geq \geq \equiv \equiv \prec \prec \succ \succ \sim \sim \preceq \preceq \succeq \succeq \simeq \simeq \ll \ll \gg \gg \asymp \asymp \subset \subset \supset \supset \approx \approx \subseteq \subseteq \supseteq \supseteq \cong \cong \sqsubseteq \sqsubseteq \sqsupseteq \sqsupseteq \bowtie \bowtie \in \in \ni \ni \propto \propto \vdash \vdash \dashv \dashv \models \models \smile \smile \mid \mid \doteq \doteq \frown \frown \parallel \parallel \perp \perp
Negated relations:
\ \not< \not< \ \not> \not> \ \not= \not= \ \not\leq \not\leq \ \not\geq \not\geq \ \not\equiv \not\equiv \ \not\prec \not\prec \ \not\succ \not\succ \ \not\sim \not\sim \ \not\preceq \not\preceq \ \not\succeq \not\succeq \ \not\simeq \not\simeq \ \not\subset \not\subset \ \not\supset \not\supset \ \not\approx \not\approx \ \not\subseteq \not\subseteq \ \not\supseteq \not\supseteq \ \not\cong \not\cong \ \not\sqsubseteq \not\sqsubseteq \ \not\sqsupseteq \not\sqsupseteq \ \not\asymp \not\asymp \ \notin \notin
Make your own:
\buildrel{\scriptscriptstyle\rm def}\over= \buildrel{\scriptscriptstyle\rm def}\over= \buildrel\rho\over\longrightarrow \buildrel\rho\over\longrightarrow
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