theorem ngmEntry_real_linear_in_J {beta_n sigma_n J_n Fbar_n sigma_prev alpha : ℝ}
(hsp : sigma_prev ≠ 0) :
ngmEntry_real beta_n sigma_n (alpha * J_n) Fbar_n sigma_prev =
alpha * ngmEntry_real beta_n sigma_n J_n Fbar_n sigma_prev := by
simp only [ngmEntry_real]
field_simp## Entry-Exit Core Definitions (merged from EntryExitDefs.lean)