SANS extremes: Q(θ=0)=0; Q(θ=π)=4π/λ

Layer 1 — Physicsin the neutron-physics subtree

Sympy-exact witness of the SANS scattering-vector extreme limits. Setup: |Q| = (4π/λ)·sin(θ/2). Identity 1 (forward, θ=0): sin(0) = 0, so |Q| = 0 — zero-momentum-transfer limit, probing the scatterer's integrated forward-scattering…

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