Apple Keynote takes Latex format equations. Some useful commands are below.
x^2 + y^2 = z^2
If you like to have subscripts
x_n^2 + y_n^2 = z_n^2
Greek letters
\alpha \beta \gamma \rho \sigma \delta \epsilon
Operators
\times \otimes \oplus \cup \cap
< > \subset \supset \subseteq \supseteq
\int \oint \sum \prod
\times \div \cup \leq \in \notin \simeq \wedge \oplus \Box \equiv \cong \vee \approx \geq \neq \cap
\leftarrow \Leftarrow \rightarrow \Rightarrow \leftrightarrow \rightleftharpoons \uparrow \downarrow \Uparrow \Downarrow \Leftrightarrow \Updownarrow \mapsto \longmapsto \nearrow \searrow \swarrow \nwarrow
\infty \forall \Re \Im \nabla \exists \partial \nexists \emptyset \varnothing \wp \complement \neg \cdots \square \surd \blacksquare \triangle
Complex equation
F=G\Big\{\frac{m_1 m_2}{r^2}\Big\}
MOSFET linear current
I_{DS,lin}=\mu_nC_{ox}\frac{W}{L}\Bigg[\big(V_{GS}-V_t\big)V_{DS}-\frac{V_{DS}^2}{2}\Bigg](1+\lambda V_{DS})
MOSFET saturation current
I_{DS,sat}=\mu_nC_{ox}\frac{W}{L}\big(V_{GS}-V_t\big)^2(1+\lambda V_{DS})
Sum
f(x) = \sum_{i=0}^n \frac{a_i}{1+x}
Integral
f(x) = \int_{a}^b x^2 \,dx
Limits
\lim_{x\to\infty} f(x)
Wave equation
\frac{\partial^2u}{\partial t^2}=c^2 \frac{\partial^2u}{\partial x^2}
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