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Linear Diffusion Equations

1. w_t = aw_xx.    Diffusion equation.
2. w_t = aw_xx + Φ(x, t).    Diffusion equation with a source.
3. w_t = aw_xx + bw_x + cw + Φ(x, t).    Convective diffusion equation with a source.
4. w_t = a(w_rr + r⁻¹w_r).    Diffusion equation with axial symmetry.
5. w_t = a(w_rr + r⁻¹w_r) + Φ(r, t).    Diffusion equation with axial symmetry (with a source).
6. w_t = a(w_rr + 2r⁻¹w_r).    Diffusion equation with central symmetry.
7. w_t = a(w_rr + 2r⁻¹w_r) + Φ(r, t).    Diffusion equation with central symmetry (with a source).