[lojban-beginners] Re: Propositional vs. predicate was: Firefox Add-on

[Pierre Abbat <phma@phma.optus.nu>]

On Tuesday 31 July 2007 11:10, Vid Sintef wrote:
> We shouldn't confuse the nature of Lojban brivla's definition with
> that of natural language counterparts. Remember, Lojban is based on
> predicate logic, not propositional logic on which most natlangs are
> based.

Propositional logic doesn't say anything about predicates and their arguments. 
How does being based on propositional logic result in natlangs having 
accusative or ergative alignment instead of numbered place structures?

Pierre