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The logician on the other hand has everything
to learn from the mathematician. Mathematics
is, with the exception of Phenomenology and
Ethics, the only science from which he can draw
any real guidance. There is therefore
every reason in the world why we should not delay
examining the fundamental nature of mathematics.

The simplest possible kind of mathematics
would be the mathematics of a system of only
two values. Do we in experience meet with any case in which
such mathematics could have any application?
I reply that we do. There are just two values that
any assertion can have. It is either true when it
has all the value it can have, or it is false, and