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a2u a?u Show that the partial differential equation a at2 - yu %3D a2u with a, B and y positives can be rewritten as

a2u a?u Show that the partial differential equation a at2 - yu %3D a2u with a, B and y positives can be rewritten as ?. au? + where i = t/w, = x/o, = y/o, with o = B/y and w = . Valy

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