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An example of a valid universal negative is "No triangles have four sides".  This is a valid universal negative because if something does not have three sides, it cannot be a triangle.

An example of a valid universal negative is "No triangles have four sides".  This is a valid universal negative because if something does not have three sides, it cannot be a triangle.

Contrary to the false assertions of logic/philosophy neophytes, universal negatives can be proven.<ref>[http://blog.faithbeyondbelief.ca/2014/08/the-universal-negative-can-it-be-proven.html A universal negative: Can it be proven?]</ref>

Contrary to the false assertions of logic/philosophy neophytes, some universal negatives can be proven.<ref>[http://blog.faithbeyondbelief.ca/2014/08/the-universal-negative-can-it-be-proven.html A universal negative: Can it be proven?]</ref>

==  External links ==

==  External links ==