Quote: the equations for many physical situations are similar because they depend on smooth fields in space with laws that are independent of direction

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Why are the equations from different phenomena so … [For example, neutron diffusion has the same equation as electrostatics.] The equation we found for neutron diffusion … large compared with the mean free path. … Is it possible that this is the clue? … the physics is put? As long as things … of change of quantities with position in space. … the form of a gradient or a divergence; … The equations of electrostatics are the simplest vector … problem--or simplification of a complicated problem--must look like …   Google-1   Google-2

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Quote: any simple, spatial physical problem, or simplification of a complicated problem, must look like electrostatics

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