Yff's Conjecture/Historical Note
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Historical Note on Yff's Conjecture
Peter Yff made this conjecture in a paper of $1963$.
It was proved by Faruk Fuad Abi-Khuzam in $1974$, and reiterated by him and Artin B. Boghossian in $1989$.
Hence despite it no longer being a conjecture, it is still referred to as one.