It is widely believed that particles in quantum mechanics are metaphysically strange; they are not individuals (the view of Cassirer 1956), in some sense of the term, and perhaps they are not even objects at all, a suspicion raised by Quine (1976a, 1990). In parallel it is thought that this difference, and especially the status of quantum particles as indistinguishable, accounts for the differe...

The fossil record preserves a wide range of events that might be used to build timescales and correlate strata from place to place. The events include the originations and extinctions of species, the occurrence of distinctive faunal assemblages, magnetic field reversals, changes in ocean chemistry, and volcanic ash falls. The fundamental task is to determine the global sequence of all these eve...

This paper deals with join-semilattices whose sections, i.e. principal filters, are pseudocomplemented lattices. The pseudocomplement of a∨b in the section [b,1] is denoted by a → b and can be considered as connective implication certain kind intuitionistic logic. Contrary to case Brouwerian semilattices, sections need not distributive essentially allows possible applications non-classical logi...