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  2. Transition metal - Wikipedia

    en.wikipedia.org/wiki/Transition_metal

    As implied by the name, all transition metals are metals and thus conductors of electricity. In general, transition metals possess a high density and high melting points and boiling points. These properties are due to metallic bonding by delocalized d electrons, leading to cohesion which increases with the number of shared electrons. However ...

  3. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  4. Theorem of transition - Wikipedia

    en.wikipedia.org/wiki/Theorem_of_transition

    In algebra, the theorem of transition is said to hold between commutative rings if [1] [2] B {\displaystyle B} dominates A {\displaystyle A} ; i.e., for each proper ideal I of A , I B {\displaystyle IB} is proper and for each maximal ideal n {\displaystyle {\mathfrak {n}}} of B , n ∩ A {\displaystyle {\mathfrak {n}}\cap A} is maximal

  5. Petri net - Wikipedia

    en.wikipedia.org/wiki/Petri_net

    A Petri net, also known as a place/transition net (PT net), is one of several mathematical modeling languages for the description of distributed systems. It is a class of discrete event dynamic system. A Petri net is a directed bipartite graph that has two types of elements: places and transitions. Place elements are depicted as white circles ...

  6. Hidden Markov model - Wikipedia

    en.wikipedia.org/wiki/Hidden_Markov_model

    Figure 1. Probabilistic parameters of a hidden Markov model (example) X — states y — possible observations a — state transition probabilities b — output probabilities. In its discrete form, a hidden Markov process can be visualized as a generalization of the urn problem with replacement (where each item from the urn is returned to the original urn before the next step). [7]

  7. 18-electron rule - Wikipedia

    en.wikipedia.org/wiki/18-electron_rule

    The rule is based on the fact that the valence orbitals in the electron configuration of transition metals consist of five (n−1)d orbitals, one ns orbital, and three np orbitals, where n is the principal quantum number. These orbitals can collectively accommodate 18 electrons as either bonding or non-bonding electron pairs.

  8. Spirit Airlines filed for bankruptcy. What does that mean for ...

    www.aol.com/spirit-airlines-filed-bankruptcy...

    NEW YORK (AP) — Spirit Airlines, the largest budget carrier in the U.S., filed for Chapter 11 bankruptcy protection Monday. The airline said customers should not see any disruption to their ...

  9. Electron configuration - Wikipedia

    en.wikipedia.org/wiki/Electron_configuration

    The naïve application of the aufbau principle leads to a well-known paradox (or apparent paradox) in the basic chemistry of the transition metals. Potassium and calcium appear in the periodic table before the transition metals, and have electron configurations [Ar] 4s 1 and [Ar] 4s 2 respectively, i.e. the 4s-orbital is filled before the 3d ...

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