Entropy (disambiguation)
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Entropy can have one of several meanings:
In science and technology:
- Thermodynamic entropy, in science, the thermodynamic homogeneity of a system, limiting the ability to extract mechanical work.
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- Introduction to entropy, an entry-level introduction
- Entropy (classical thermodynamics), macroscopic understanding of thermodynamic entropy
- Entropy (statistical thermodynamics), microscopic understanding of thermodynamic entropy
- Gibbs entropy, statistical entropy of a thermodynamic system
- von Neumann entropy, entropy of a quantum-mechanical system
- Boltzmann entropy formula, S = k ln W
- Information entropy (Shannon entropy), in statistics, the amount of information that is lacking in a random variable
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- Entropy encoding, data compression strategies that set out to achieve message lengths close to the Shannon entropy
- Entropy (ecology), use of Shannon entropy as a measure of biodiversity in the study of ecology
- Renyi entropies, family of diversity measures generalising Shannon entropy; used to define fractal dimensions.
In mathematics:
- Measure theoretic entropy, a measure of exponential growth in dynamical systems; equivalent to the rate of increase of Shannon entropy of a trajectory in trajectory-space.
- Topological entropy , a measure of exponential growth in dynamical systems; equivalent to the rate of increase of α->0 Renyi entropy of a trajectory in trajectory-space.
In computing:
- Entropy (anonymous data store), a computer network designed to be resistant to censorship
- Entropy (PHP), a version of PHP compiled for Mac OS X
In literature:
- Entropy (newspaper), a student newspaper at the University of South Australia.
- Entropy (film), a 1999 film directed by Phil Joanou.
- Entropy (board game), the name of two board games
- a short story by Thomas Pynchon
- Entropy (Series), a reality "series" that focuses on random things between a group of young friends.
In music:
- Entropy (album), a split vinyl album by Anathallo and Javelins
- Entropy ry., a student organization for electronic music at Helsinki University of Technology
- a song on the album Against the Grain by Bad Religion
- a song on the album Matter+Form by VNV Nation
- a song on the b album by Moxy Früvous
- a song by MC Hawking
In television:
- "Entropy" (Buffy episode), an episode of the TV series Buffy the Vampire Slayer
In medicine:
- Entropy (monitor) a monitor of anaesthetic depth using analysis of a 2 lead EEG.
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