📁 Source: Mathlib/Data/Nat/Choose/Vandermonde.lean
add_choose_eq
sum_range_choose_sq
choose
Finset.sum
instAddCommMonoid
Finset.HasAntidiagonal.antidiagonal
instAddMonoid
Finset.Nat.instHasAntidiagonal
Polynomial.coeff_X_add_one_pow
cast_id
pow_add
Polynomial.coeff_mul
Finset.sum_congr
Finset.range
Monoid.toNatPow
instMonoid
instAtLeastTwoHAddOfNat
two_mul
choose_symm
Finset.mem_range_succ_iff
sq
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