We do not aim at « mathematical rigour » of exposition, which in theoretical physics often amounts to self-deception.
--
"Quantum Mechanics: Non-relativistic Theory", together with L. D. Landau, translated by John Menzies (third edition 1991), p. xiEvgeny Lifshitz
» Evgeny Lifshitz - all quotes »
What appear to be the most valuable aspects of the theoretical physics we have are the mathematical descriptions which enable us to predict events. These equations are, we would argue, the only realities we can be certain of in physics; any other ways we have of thinking about the situation are visual aids or mnemonics which make it easier for beings with our sort of macroscopic experience to use and remember the equations.
Celia Green
Therefore psychologically we must keep all the theories in our heads, and every theoretical physicist who is any good knows six or seven different theoretical representations for exactly the same physics.
Richard Feynman
Mathematical physics is in the first place physics and it could not exist without experimental investigations.
Peter Debye
If I have had any success in mathematical physics, it is, I think, because I have been able to dodge mathematical difficulties.
Josiah Willard Gibbs
Every physicist (naturally, this equally applies to other specialities, but I re- strict myself to physicists for definitiveness) should simultaneously know, apart from theoretical physics, a wealth of facts from different branches of physics and be familiar with the newest notable accomplishments.
Vitaly Ginzburg
Lifshitz, Evgeny
Ligeti, Gyorgy
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