音乐戏剧
发表于 2025-3-28 17:12:40
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灿烂
发表于 2025-3-28 19:55:14
On Involutive Systems of First-order Nonlinear Partial Differential Equations,eal analytic in an open subset of (., ζ., ζ) ∈ ℝ.×ℂ×ℂ. and holomorphic in (ζ., ζ). The function . is assumed to be a .. solution. The .. satisfy an involution condition and .... ∧ ... ∧ .... ≠ 0 where .. denotes the exterior derivative in ζ = (ζ., ..., ζ.).