Difference between revisions of "Universal negative"
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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, 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> | + | Contrary to the false assertions of logic/philosophy neophytes about it being impossible to prove a universal negative, 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 == | ||
Revision as of 20:13, September 22, 2014
In logic, a universal negative is a proposition of the form “No S is P.” Symbol: E, e.[1]
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 about it being impossible to prove a universal negative, some universal negatives can be proven.[2]