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Binary relations and hypergroupoids
2000The author associates a partial hyperoperation \(\langle\widetilde\circ_R\rangle\) to every binary relation \(R\) defined on a non-empty set \(H\) in the following way: \(x\widetilde\circ_R y=\{z\in H\mid xRz,\;zRy\}\). The hyperstructure \(\langle H,\widetilde\circ_R\rangle\) is a partial hypergroupoid and the necessary and sufficient condition so ...
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Creation of a needle of longitudinally polarized light in vacuum using binary optics
Nature Photonics, 2008Colin J R Sheppard
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A wide star–black-hole binary system from radial-velocity measurements
Nature, 2019Ji-Feng Liu +2 more
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