theorem spatial_decay_strictly_decreasing
(ν : ℝ) (hν_pos : 0 < ν) (hν_lt : ν < 1) (k : ℕ) :
ν ^ (k + 1) < ν ^ k := by
have hpk : 0 < ν ^ k := pow_pos hν_pos k
calc ν ^ (k + 1) = ν ^ k * ν := pow_succ ν k
_ < ν ^ k * 1 := by apply mul_lt_mul_of_pos_left hν_lt hpk
_ = ν ^ k := by ringResults 1-7: Relaxation on the CES Potential Landscape