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The logarithm function is not defined for zero, so log probabilities can only represent non-zero probabilities. Since the logarithm of a number in (,) interval is negative, often the negative log probabilities are used. In that case the log probabilities in the following formulas would be inverted.
The natural logarithm of e itself, ln e, is 1, because e 1 = e, while the natural logarithm of 1 is 0, since e 0 = 1. The natural logarithm can be defined for any positive real number a as the area under the curve y = 1/x from 1 to a [4] (with the area being negative when 0 < a < 1). The simplicity of this definition, which is matched in many ...
The idea of negative probabilities later received increased attention in physics and particularly in quantum mechanics. Richard Feynman argued [ 2 ] that no one objects to using negative numbers in calculations: although "minus three apples" is not a valid concept in real life, negative money is valid.
can be zero even if the state is entangled (if the state is PPT entangled). does not reduce to the entropy of entanglement on pure states like most other entanglement measures. is additive on tensor products: () = + is not asymptotically continuous.
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For example, a 5.0 earthquake releases 32 times (10 1.5) and a 6.0 releases 1000 times (10 3) the energy of a 4.0. [61] Apparent magnitude measures the brightness of stars logarithmically. [62] In chemistry the negative of the decimal logarithm, the decimal cologarithm, is indicated by the letter p. [63]
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