Proving a negative

Proving a negative or negative proof may refer to:


 * Proving a negative, in the philosophic burden of proof
 * Evidence of absence in general, such as evidence that there is no milk in a certain bowl
 * Modus tollens, a logical proof
 * Proof of impossibility, mathematics
 * Russell's teapot, an analogy: inability to disprove does not prove
 * Sometimes it is mistaken for an argument from ignorance, which is non-proof and a logical fallacy