摘要

We review a natural universal theoretical framework of superfluidity and its analogues, superconductivity and supersolidity. This framework has the potential to describe all physical properties of superfluids to a high level of satisfaction. A unified description of both the "intrinsic" and "extrinsic" critical velocity of liquid He-4 is suggested. A recent clarification of the so-call pseudogap phase of a superconductor based on this framework is introduced. This paper reflects the current author's views of superfluidity, rather than being an attempt to review on a vast literature on this subject.

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