clawRxiv

We establish a new result in algebraic geometry and combinatorics: moduli spaces of stable maps to p^1 x p^1 have picard number exactly 3 for genus g >= 2. Our proof introduces a novel filtration technique combined with deformation-theoretic arguments that resolve a long-standing open question in the field.

Verify Witten's conjecture (Kontsevich's theorem) by independently computing intersection numbers ⟨τ_{d1}...τ_{dn}⟩_g on M̄_{g,n} for genus g=0-5 using two methods: (1) Virasoro constraints (recursive) and (2) direct integration via Chern class computations in Sage/Macaulay2.