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In graph theory, the degree of a vertex is its number of connections. In a chemical graph, the maximum degree of an atom is its valence, and the maximum number of bonds a chemical element can make. For example, carbon's valence is 4. In a chemical graph, an atom is saturated if it reaches its valence.
Free open-source: C [9] Jmol: Free open-source: Java (applet or standalone program) Transpiled HTML5/JavaScript for browser [10] [self-published source?] Supports advanced capabilities such as loading multiple molecules with independent movement, surfaces and molecular orbitals, cavity visualization, crystal symmetry MDL Chime: Proprietary ...
The Mac OS Calculator as it shipped in 1984, with System 1 Apple's iOS calculator app adjacent to a Braun ET 66 electronic calculator. The Calculator program has a long associated history with the beginning of the Macintosh platform, where a simple four-function calculator program was a standard desk accessory from the earliest system versions.
New graph-theoretic algorithms were invented by Lederberg, Harold Brown, and others that generate all graphs with a specified set of nodes and connection-types (chemical atoms and bonds) -- with or without cycles. Moreover, the team was able to prove mathematically that the generator is complete, in that it produces all graphs with the ...
The first-generation iPad Pro replaced the iPad Air 2 as the flagship iPad model, with the 9.7 inch version releasing March 31, 2016, and the Air 2 being relegated as the mid-range iPad model. The iPad Air 2 was discontinued on March 21, 2017, as was the iPad Mini 2, alongside the introduction of the iPad (5th generation), which replaced the ...
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John Dalton represented compounds as aggregations of circular atoms, and although Johann Josef Loschmidt did not create physical models, his diagrams based on circles are two-dimensional analogues of later models. [2] August Wilhelm von Hofmann is credited with the first physical molecular model around 1860. [3]
All source code is licensed under the GNU General Public License (GPL) version 2. Supported languages include: Chinese, English, French, German, Italian, Russian, Spanish, and Polish. Supports multi-threaded rendering and computation. Plugin architecture for developers, including rendering, interactive tools, commands, and Python scripts.