Abstract
The relationship between vortices and superfluidity in liquid helium was first suggested by Onsager and Feynman in the 1950s. Their predictions were confirmed experimentally some ten years later. Development of this concept shows that vortex flow has significance far beyond superfluidity. It is relevant, for example, to high-temperature superconductors; some systems of magnetic spin; and perhaps even to cosmic phase transitions immediately after the Big Bang. It may also help understanding of the nature of turbulence, one of the major unsolved problems in fluid mechanics.
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