منابع مشابه
On Vaughan Pratt's crossword problem
Vaughan Pratt has introduced objects consisting of pairs (A, W ) where A is a set and W a set of subsets of A, such that (i) W contains ∅ and A, (ii) if C is a subset of A×A such that for every a ∈ A, both {b | (a, b) ∈ C} and {b | (b, a) ∈ C} are members of W (a “crossword” with all “rows” and “columns” in W ), then {b | (b, b) ∈ C} (the “diagonal word”) also belongs to W, and (iii) for all di...
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ژورنال
عنوان ژورنال: Pharmacy Today
سال: 2021
ISSN: ['1042-0991', '2773-0735']
DOI: https://doi.org/10.1016/j.ptdy.2020.12.018