معادله
preferred label: equation @en
type: Concept
narrower: معادله پایکار

معادله مثلثاتی-گوردن
preferred label: sine-Gordon equation @en
type: Concept
broader: معادله پایکار

معادله پایکار
narrower: معادله مثلثاتی-گوردن
narrower: معادله اینشتین-ماکسول
narrower: معادله میدان اینشتین
broader: معادله
preferred label: field equation @en
type: Concept

معادله اینشتین-ماکسول
preferred label: Einstein-Maxwell equation @en
type: Concept
broader: معادله پایکار

معادله میدان اینشتین
preferred label: Einstein field equation @en
type: Concept
broader: معادله پایکار