I'll see your Quine and raise you a Bolzano: http://plato.stanford.edu/entries/bolzano/ http://plato.stanford.edu/entries/bolzano/ http://plato.stanford.edu/e

I'll see your Quine and raise you a Bolzano: http://plato.stanford.edu/entries/bolzano/ http://plato.stanford.edu/entries/bolzano/ http://plato.stanford.edu/entries/bolzano-logic/ http://plato.stanford.edu/entries/bolzano-logic/