SAR: S=A^z·c; dS/dA=A^(z−1)·c·z; elasticity=z exactly; S(2A)/S(A)=2^z

Sympy-exact symbolic witness of the Arrhenius species-area canonical form, elasticity identity, and log-log slope. Setup: c, A, z — all positive symbols. SAR: S = c·A^z (sympy canonical 'A**z*c'). Derivative: dS/dA = c·z·A^(z−1) (sympy…