Behrend.sum_eq

∀ {n d : ℕ}, ∑ i, d * (2 * d + 1) ^ ↑i = ((2 * d + 1) ^ n - 1) / 2

Defined in: Mathlib.Combinatorics.Additive.AP.Three.Behrend
Cited by: 1 results in Mathlib
Foundations: Depth 80 from the axioms · uses propext, Classical.choice, Quot.sound

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