Quantum mechanical derivation of the Wallis formula for π http://scitation.aip.org/content/aip/journal/jmp/56/11/10.1063/1.4930800 …
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Quantum mechanical derivation of the Wallis formula for π http://scitation.aip.org/content/aip/journal/jmp/56/11/10.1063/1.4930800 …