Titlebook: Android Recipes; A Problem-Solution A Dave Smith,Erik Hellman Book 2016Latest edition Dave Smith and Erik Hellman 2016 android.mobile.refer

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On Involutive Systems of First-order Nonlinear Partial Differential Equations,eal analytic in an open subset of (., ζ., ζ) ∈ ?.×?×?. 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.).