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In [[logic]], a '''universal negative''' is a proposition of the form “No S is P.” Symbol: E, e.<ref>[http://dictionary.reference.com/browse/universal+negative Universal negative]</ref>

In [[logic]], a '''universal negative''' is a proposition of the form “No S is P.” Symbol: E, e.<ref>[http://dictionary.reference.com/browse/universal+negative Universal negative]</ref>

An example of a valid universal negative is "No triangles have 4 sides".  This is a valid universal negative because if something does not have 3 sides, it cannot be a triangle.<ref>[http://blog.faithbeyondbelief.ca/2014/08/the-universal-negative-can-it-be-proven.html A universal negative: Can it be proven]</ref>

An example of a valid universal negative is "No triangles have 4 sides".  This is a valid universal negative because if something does not have 3 sides, it cannot be a triangle.<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 ==