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  2. List of quantum-mechanical systems with analytical solutions

    en.wikipedia.org/wiki/List_of_quantum-mechanical...

    which is an eigenvalue equation. Very often, only numerical solutions to the Schrödinger equation can be found for a given physical system and its associated potential energy. However, there exists a subset of physical systems for which the form of the eigenfunctions and their associated energies, or eigenvalues, can be found.

  3. Standard model (set theory) - Wikipedia

    en.wikipedia.org/wiki/Standard_model_(set_theory)

    A standard model M that satisfies the additional transitivity condition that x ∈ y ∈ M implies x ∈ M is a standard transitive model (or simply a transitive model). Usually, when one talks about a model M of set theory, it is assumed that M is a set model , i.e. the domain of M is a set in V.

  4. Standard solution - Wikipedia

    en.wikipedia.org/wiki/Standard_solution

    Standard solutions are generally prepared by dissolving a solute of known mass into a solvent to a precise volume, or by diluting a solution of known concentration with more solvent. [1] A standard solution ideally has a high degree of purity and is stable enough that the concentration can be accurately measured after a long shelf time.

  5. System of polynomial equations - Wikipedia

    en.wikipedia.org/wiki/System_of_polynomial_equations

    A natural example of such a question concerning positive-dimensional systems is the following: decide if a polynomial system over the rational numbers has a finite number of real solutions and compute them. A generalization of this question is find at least one solution in each connected component of the set of real solutions of a polynomial ...

  6. More than 170 killed after South Korean jet crash-lands at ...

    www.aol.com/least-85-dead-south-korean-041310472...

    The Transport Ministry will also inspect all Boeing 737-800 planes – the same model as the one that crashed – operating in the country, according to Deputy Transport Minister Joo Jong-wan.

  7. Kremlin praises Trump for criticising Ukrainian strikes deep ...

    www.aol.com/news/kremlin-praises-trumps...

    MOSCOW (Reuters) -The Kremlin praised U.S. President-elect Donald Trump on Friday for criticising Ukrainian missile strikes deep into Russian territory but said discussions about deploying ...

  8. Congress could ban new drones from two Chinese manufacturers

    www.aol.com/news/dji-could-banned-launching...

    WASHINGTON (Reuters) -China-based DJI and Autel Robotics could be banned from selling new drones in the United States market under an annual military bill set to be voted on later this week by the ...

  9. Feasible region - Wikipedia

    en.wikipedia.org/wiki/Feasible_region

    Here the feasible set is the set of pairs (x, y) in which the value of x is at least 1 and at most 10 and the value of y is at least 5 and at most 12. The feasible set of the problem is separate from the objective function, which states the criterion to be optimized and which in the above example is +.