Who did the 1957 winner of the Nobel Prize in Physics work with on the problem of magnetic flux?
Byers-Yang theorem: In quantum mechanics, the Byers-Yang theorem states that all physical properties of a doubly connected system (an annulus) enclosing a magnetic flux formula_1 through the opening are periodic in the flux with period formula_2 (the magnetic flux quantum). Byers-Yang theorem:  The theorem was first stated and proven by Nina Byers and Chen-Ning Yang (1961), and further developed by Felix Bloch (1970).
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