| 释义 |
exact differential equation A differential equation Pdx + Qdy = 0 is exact if Pdx + Qdy is the total differential of a function f(x,y) so that the general solution has the from f = constant. Even when Pdx + Qdy is not an exact differential, an integrating factor m(x,y) may be found so that mPdx + mQdy is exact.
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