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$$\displaystyle R^{\mu\nu}-\frac{1}{2}g^{\mu\nu}R = \frac{8\pi \kappa}{c^{2}}T_{\mu\nu} $$

$$\displaystyle \hat{\mit H}\Psi = E\Psi $$

$$\displaystyle \mathcal{S} = \int_{t_1}^{t_2} Ldt $$

$$\displaystyle \dfrac{\partial\mathcal{L}}{\partial q_i} - \dfrac{d}{dt}\dfrac{\partial\mathcal{L}}{\partial\dot{q_i}} = 0 $$

$$\displaystyle (i\hbar\gamma^\mu\partial_\mu-mc)\psi = 0 $$