Symmetries of Maxwell’s Equations by W.I. Fushchich, A.G. Nikitin.
Approach your problems from the right end It isn't that they can't see the solution. It is and begin with the answers. Then one day, that they can't see the problem. perhaps you will find the fina question. G. K. Chesterton. The Scandal of Father 'The Hermit Oad in Crane Feather...
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