Proof of impossibility, a proof that a particular problem cannot be solved.
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Null result, a result which shows no evidence of the intended effect.
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A possible solution to the problem was shown by Woldemar Voigt (1887), who investigated the Doppler effect for waves propagating in an incompressible elastic medium and deduced transformation relations that left the Wave equation in free space unchanged, and explained the negative result of the Michelson-Morley Experiment.
Type II errors which consist of failing to reject a null hypothesis that is false; this amounts to a false negative result.
After Burma became a British colony in 1863 with Victoria Point opposite the Kra estuary as its southernmost point, an exploration was undertaken, again with negative result.