|Demonstratives: E.g. this, that, that one. Problems in language use bcause of lack of clarity when referring back to prior description. - In logic missing expressibility of uniqueness. See also anaphora, deixis, relations, logical proper names, index words, indexicality, iota operator.|
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dthat / Kaplan / rigid making operator / Stalnaker (Kaplan 1978) - the object always refers back to the act.world - (make rigid) - then the speaker is in each of the poss. worlds the speaker from the original world.
Ways a World may be Oxford New York 2003