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Economic Analysis Of Domestic Solar Still In The Climate Of Costa Rica
(Universidad Nacional (Costa Rica), 1990)
-In many communities of the developing countries, including Costa Rica and especially in coastal
areas, there exists a shortage of potable water. Taking into account the fact that transportation/distribution
of potable ...
Propositional calculus and binary calculus
(Universidad Nacional [Costa Rica], 1990-01-01)
We present an efficient method of propositional calculus which allows the manipulation of logical functions with an arbitrary number of propositional variables. This method is base on the use of binary sequences (in other ...