Sympy-exact witness of the misfit-strain anchor. Setup: ε = (a_f - a_s)/a_s. Identity 1 (lattice-matched, a_f = a_s): ε = 0 — no coherency strain. Identity 2 (2% mismatch, a_f = 51/50·a_s): ε = (51/50 - 1)/1 · 1 = 1/50 (exact Rational —…
Sympy-exact witness of the misfit-strain anchor. Setup: ε = (a_f - a_s)/a_s. Identity 1 (lattice-matched, a_f = a_s): ε = 0 — no coherency strain. Identity 2 (2% mismatch, a_f = 51/50·a_s): ε = (51/50 - 1)/1 · 1 = 1/50 (exact Rational —…