= Superfluidity
{wiki}
<Superfluidity> is a quantum-fluid response with <phase stiffness> and flow without viscous dissipation in an appropriate low-speed regime. A <superfluid> supports a phase-gradient current; defects and excitations can limit that flow. <Bose-Einstein condensation> concerns macroscopic one-particle occupation and is a distinct criterion: the Gaussian <phase stiffness> theory can have divergent absolute-phase fluctuations while retaining a cost for <gradients>.
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