Report - Exemplo 1 - ppgia.pucpr.brjamhour/Download/difusao.pdf · Exemplo 1 In[11]:= Clear[u, r, t] Dab = 1*^-10; R = 0.025; sR = 1*^-100; eq = D[u[t, r], t]⩵ Dab r D[r D[u[t, r], r], r]

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