liliy
DOES ANYONE KNOW MATHEMATICA?????



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modphysnoob
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YES

modphysnoob
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what's your question , sailor?

liliy
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okay: i need to use derivative to verify that : p(x,t) = (1/(Sqrt[4 Pi t])) Exp[ x^2/(4 t)
is the solution of the diffusion equation dp/dt= d^2p/dx^2

liliy
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i got the value for dp/dt with the function :pt = D[(1./(Sqrt[4 Pi t])) Exp[ x^2/(4 t)], t]

liliy
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but my second derivative of dx gives me 0.

liliy
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dx = D[(1./(Sqrt[4 Pi t])) Exp[ x^2/(4 t)], {x, 2}]
is there soemthign wrong with my equation?

liliy
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:(

modphysnoob
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so are you trying to solve differential equation or take second derivative?

modphysnoob
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second derviative goes like this
D[ Type function here ,{x,2}]

liliy
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ya thats what i did

modphysnoob
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D[(1./(Sqrt[4 Pi t])) * Exp[ x^2/(4 t)], {x, 2}]

modphysnoob
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./ is not used in mathematica, it is matlab notation

liliy
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./ i was just trying to make the whole thing into a number so i tried to multiple (dividde) by 1. lol

liliy
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