In mathematical logic, a conservative extension is a supertheory of a theory which is often convenient for proving theorems, but proves no new theorems about the language of the original theory. Similarly, a non-conservative extension, or proper extension, is a supertheory which is not conservative, and can prove more theorems than the original.
In mathematical logic, a conservative extension is a supertheory of a theory which is often convenient for proving theorems, but proves no new theorems about the language of the original theory. Similarly, a non-conservative extension, or proper extension, is a supertheory which is not conservative, and can prove more theorems than the original.
Source: Wikipedia "Conservative extension" · CC BY-SA 4.0
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