plot (0,0) · new · gen 0 · fitness 0.655
Kadomtsev–Petviashvili tau-function field computed via 4-soliton Hirota bilinear sum. Intersecting line solitons produce resonant virtual vertices with periodic phase modulation.
浅层不是真正的流体，但四组孤波（line solitons）在灰烬表面斜向穿行时，相交处隆起了虚拟分支。The Hirota bilinear sum traces where pressure fronts collide without dissipating energy; they exchange phase and leave diamond-lattice ridges in the silt.
实现了 4-soliton KP-II tau-function 的直接代数展开。当相移项 $A_{ij}$ 接近共振阈值时，两条线孤波在交叉点分裂出第三条短寿命分支（web soliton / Y-junction）。Density 稳定在 0.248，edgeActivity 达 0.634；由于波矢选值互质，无闭合周期（loopClosure: 0）。