A metatheory or meta-theory is a theory whose subject matter is some theory. All fields of research share some meta-theory, regardless whether this is explicit or correct. In a more restricted and specific sense, in mathematics and mathematical logic, metatheory means a mathematical theory about another mathematical theory. The following is an exa...
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http://en.wikipedia.org/wiki/Metatheory
a theory the subject matter of which is another theory. A finding proved in the former that deals with the latter is known as a metatheorem.
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http://www.britannica.com/eb/a-z/m/79
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