Re: compound propositions
Date: Thu, 18 Mar 2010 15:18:30 -0300
paul c wrote:
>> paul c wrote: >> >>> David BL wrote: >>> ... >>> >>>> This boolean valued function can be said to represent a >>>> predicate under an interpretation but I'm not sure if that's what you >>>> mean. More specifically, what do you mean by "satisfy" when you say >>>> relations satisfy predicates? >>>> ...
>>> match the variable names apparent in the predicates and the attribute >>> types are applicable for whatever manipulations (eg., aggregation) >>> the predicate states. >> >> >> In other words, the extension of a predicate is the set of all tuples >> that satisfy the predicate. >> ...
> Yes, but David B asked what 'satisfy' means.
In that case, I suggest you not shy away from equality and boolean truth values. Unless you can think of a situation where "satisfy" means something other than "predicate evaluates to true". Received on Thu Mar 18 2010 - 19:18:30 CET