E = h f

n_1 \sin\theta_1 = n_2 \sin\theta_2

F = \tfrac{1}{4\pi\varepsilon_0}\tfrac{q q'}{r^2}

v = \lambda f

E = -\tfrac{13.6}{n^2}\,\mathrm{eV}

B = \tfrac{\mu_0 I}{2\pi r}

I = I_0 \cos^2\theta

E = \Delta m\, c^2

N = N_0\, e^{-t/\tau}

Z = \sqrt{R^2 + (X_L - X_C)^2}

\tfrac{1}{s} + \tfrac{1}{s'} = \tfrac{1}{f}

a study notebook

Lucas Notebook

The equations my degree never made easy to find, with the reasoning that makes them stick. I keep them here so I stop digging through old PDFs the night before an exam.

Fundamentals of Physics

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