Flataway a2 closed
v296_flataway_a2_closed.py · frontier
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FLATAWAY.A2.CLOSED.01 — the exact a₂ coefficient in CLOSED FORM (replacing v295's validated-numeric sum). [E] the operator tails telescope to a geometric series (Φ(n,n+4k)=e^{−nt}C_k/(16k²), C_k+D_k e^{−4kt}=4kt(1−e^{−4kt})), giving W_k^tail=t(1−e^{−4kt})/(8k(1−e^{−t})); [E] the middle is finite (4k−1 terms incl. the degenerate diagonal Φ(2k,2k)=(t²/2)e^{−2kt}); [E] closed form W_k(t)=t(1−e^{−4kt})/(8k(1−e^{−t}))+½Σ_{m=1}^{4k−1}Φ(m,4k−m), with W_1(t)=t(2t eᵗ+e³ᵗ+3e²ᵗ+eᵗ−1)e^{−3t}/8, reproducing v295 to machine precision; [E] positivity manifest term by term; [E] small-t W_k=t/2+O(t³) (mode-independent leading 1/2, the t² term cancels).
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