📖 PCA Loadings The loadings $\\phi_{1}, \\ldots, \\phi_p$ define the first PC direction: $Z_1 = \\phi_{11}X_1 + \\cdots + \\phi_{p1}X_p$ subject to $\\sum_{j=1}^p \\phi_{j1}^2 = 1$. From: Intro to Statistical Learning Learn more:

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💡 Proposition I.6 If in a triangle two angles be equal to one another, the sides which subtend the equal angles will also be equal to one another. From: Euclid's Elements Learn more:

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