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A proposition or theory is '''falsifiable''' if it is possible to conduct, or imagine, an experiment that could have an outcome at odds with the theory.  This is not the same as actually being false.  A proposal or theory that could not possibly be shown to be false, even if it were false, is not falsifiable.  Of course, if one can conduct an experiment and it has an outcome that is at odds with the theory, then that theory is both falsifiable and demonstrably false.

A proposition or theory is '''falsifiable''' if it is possible to conduct, or imagine, an experiment that could have an outcome at odds with the theory.  This is not the same as actually being false.<ref>[http://www.encyclopedia.com/doc/1O87-falsifiability.html Definition] A Dictionary of Psychology, Andrew M. Colman, via encyclopedia.com</ref> A proposal or theory that could not possibly be shown to be false, even if it were false, is not falsifiable.  Of course, if one can conduct an experiment and it has an outcome that is at odds with the theory, then that theory is both falsifiable and demonstrably false.

The interesting cases of this are propositions that are believed to be true, and can be "verified" by experiments, but the experiments in fact have no way of having a negative outcome.  This renders the experiments useless and the proposition unfalsifiable.

The interesting cases of this are propositions that are believed to be true, and can be "verified" by experiments, but the experiments in fact have no way of having a negative outcome.  This renders the experiments useless and the proposition unfalsifiable.