normal derivative
preferred label: مشتق قائم @fa
type: Concept
related: Cauchy-Kowalewski existence theorem

fundemental existence theorems
preferred label: قضایای اساسی وجود @fa
type: Concept
narrower: Cauchy-Kowalewski existence theorem

Cauchy-Kowalewski existence theorem
related: normal derivative
related: harmonic function
broader: fundemental existence theorems
preferred label: قضیه وجود کوشی-کوالسکی @fa
type: Concept

harmonic function
preferred label: تابع همساز @fa
type: Concept
related: Cauchy-Kowalewski existence theorem