推 destinycode:V is a gradient field <=>V is a conservative field 10/19 04:33
→ destinycode:we assume that V=del[f] 10/19 04:34
→ destinycode:obviously f=y*x^2+c,where c is a constant 10/19 04:34
→ destinycode:τ:-π/2 -> π/2 =>R:(1,-1) -> (1,1) 10/19 04:34
→ destinycode:then SV*dR=f(1,1)-f(1,-1)=2 10/19 04:34
→ gnsh:謝啦!! 完全沒想到XD 10/19 10:31