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  2. Schengen Agreement - Wikipedia

    en.wikipedia.org/wiki/Schengen_Agreement

    The Schengen Agreement (English: / ˈ ʃ ɛ ŋ ə n / SHENG-ən, Luxembourgish: [ˈʃæŋən] ⓘ) is a treaty which led to the creation of Europe's Schengen Area, in which internal border checks have largely been abolished.

  3. Visa policy of the Schengen Area - Wikipedia

    en.wikipedia.org/wiki/Visa_policy_of_the...

    Providing that the visa application is admissible and there are no issues with the application, a decision must be given within 15 calendar days of the date on which the application was lodged. [84] The standard application fee for a Schengen visa is EUR 90. There is a reduced fee of EUR 45 for children aged 6 to 12, and no fee for children ...

  4. Schengen Area - Wikipedia

    en.wikipedia.org/wiki/Schengen_Area

    According to the Schengen rules, hotels and other types of commercial accommodation must register all foreign citizens, including citizens of other Schengen states, by requiring the completion of a registration form by their own hand. This does not apply to accompanying spouses and minor children or members of travel groups.

  5. Josef Melan - Wikipedia

    en.wikipedia.org/wiki/Josef_Melan

    Josef Melan studied civil engineering at TU Wien from 1869 to 1874 and thereafter was an assistant to Emil Winkler at the Chair of Railway Engineering and Bridge-Building. . Melan wrote his habilitation thesis on the theory of bridges and railways at the same university in 1880 and remained on the teaching staff there until

  6. Hilbert's problems - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_problems

    (b) the rigorous theory of limiting processes "which lead from the atomistic view to the laws of motion of continua" Unresolved, or partially resolved, depending on how the original statement is interpreted. [14] Items (a) and (b) were two specific problems given by Hilbert in a later explanation. [1]

  7. Bredt's rule - Wikipedia

    en.wikipedia.org/wiki/Bredt's_rule

    In organic chemistry, an anti-Bredt molecule is a bridged molecule with a double bond at the bridgehead. Bredt's rule is the empirical observation that such molecules only form in large ring systems.

  8. Seven Bridges of Königsberg - Wikipedia

    en.wikipedia.org/wiki/Seven_Bridges_of_Königsberg

    Philosophers have noted that Euler's proof is not about an abstraction or a model of reality, but directly about the real arrangement of bridges. Hence the certainty of mathematical proof can apply directly to reality. [6] The proof is also explanatory, giving insight into why the result must be true. [7]

  9. Game theory - Wikipedia

    en.wikipedia.org/wiki/Game_theory

    The application of game theory to political science is focused in the overlapping areas of fair division, political economy, public choice, war bargaining, positive political theory, and social choice theory. In each of these areas, researchers have developed game-theoretic models in which the players are often voters, states, special interest ...