Absolute value function ( $∣ x ∣$ )

The absolute value function is convex by the triangle inequality:

∣ t x + (1 - t) y ∣ \leq t ∣ x ∣ + (1 - t) ∣ y ∣.

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Bipartite Szemerédi regularity lemma
Ground-state eigenfunction of a confining Schrödinger operator
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Subgradient of the absolute value

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