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how do you input 2 unknown variables (u1 and u2) in a system of pde

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how do you input 2 unknown variables (u1 and u2) or more in a system of pde for pde physic model.
ex.
pde 1: du1/dt=du2/dx-u2+u1
pde 2: du2/dt=d2u1/dx2+u1-u2

0 Replies Last Post 8 mar 2012, 03:35 GMT-5
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Hello David Davidson

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