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Dec 27, 2015 at 8:01 comment added Mauro ALLEGRANZA @Mageek - I agree; and this is way Hilbert's proposal is not usually adopted. In addition, in the classical context, due to the interdefinibility of the quantifiers, a single axiom, like : $A(t) \to \exists x A(x)$, plus a rule of inference, like : "from $A \to B$, derive $\exists x A \to B$, provided that $x$ is not free in $B$" are enough for the quantificational part. Thus, there is very little "space" for further improvements...
Dec 26, 2015 at 22:46 vote accept Alexandre Khoury
Dec 26, 2015 at 22:45 comment added Alexandre Khoury Thanks for answering. Yeah I've read about that, but there is this weird thing about "replacing the occurences of x by squares" and "linking to" the tau. And the fact that the axiom of choice is kind of embedded into the system... which makes it not very elegant according to me.
Dec 26, 2015 at 14:57 history edited Mauro ALLEGRANZA CC BY-SA 3.0
added 26 characters in body
Dec 26, 2015 at 14:08 history answered Mauro ALLEGRANZA CC BY-SA 3.0