This chapter introduces the theory of superfluid 3He. It begins with a summary of the BCS theory of superconductivity, which is the basis for the development of the most complex theory of superfluid 3He. This is followed by the Ginzburg–Landau theory that is only valid for superfluids at temperatures near their transition temperature, Tc. A discussion of spin-triplet pairing leads to the identification of the B phase with the Balian–Werthamer state and the A phase with the Anderson–Morel state.
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