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  2. Individuals with Disabilities Education Act - Wikipedia

    en.wikipedia.org/wiki/Individuals_with...

    IDEA is composed of four parts, the main two being part A and part B. [2] Part A covers the general provisions of the law; Part B covers assistance for education of all children with disabilities; Part C covers infants and toddlers with disabilities, including children from birth to age three; and Part D consists of the national support ...

  3. Necessity and sufficiency - Wikipedia

    en.wikipedia.org/wiki/Necessity_and_sufficiency

    In logic and mathematics, necessity and sufficiency are terms used to describe a conditional or implicational relationship between two statements. For example, in the conditional statement: "If P then Q", Q is necessary for P, because the truth of Q is guaranteed by the truth of P.

  4. Mathematical proof - Wikipedia

    en.wikipedia.org/wiki/Mathematical_proof

    For example, direct proof can be used to prove that the sum of two even integers is always even: Consider two even integers x and y. Since they are even, they can be written as x = 2a and y = 2b, respectively, for some integers a and b. Then the sum is x + y = 2a + 2b = 2(a+b). Therefore x+y has 2 as a factor and, by definition, is even. Hence ...

  5. Idea - Wikipedia

    en.wikipedia.org/wiki/Idea

    The argument over the underlying nature of ideas is opened by Plato, whose exposition of his theory of forms—which recurs and accumulates over the course of his many dialogs—appropriates and adds a new sense to the Greek word for things that are "seen" (re. εἶδος) that highlights those elements of perception which are encountered without material or objective reference available to ...

  6. Rational choice model - Wikipedia

    en.wikipedia.org/wiki/Rational_choice_model

    Rational choice theory has proposed that there are two outcomes of two choices regarding human action. Firstly, the feasible region will be chosen within all the possible and related action. Second, after the preferred option has been chosen, the feasible region that has been selected was picked based on restriction of financial, legal, social ...

  7. Article Four of the United States Constitution - Wikipedia

    en.wikipedia.org/wiki/Article_Four_of_the_United...

    The Guarantee Clause mandates that all U.S. states must be grounded in republican principles such as the consent of the governed. [17] By ensuring that all states must have the same basic republican philosophy, the Guarantee Clause is one of several portions of the Constitution which mandates symmetric federalism between the states.

  8. Multiple discovery - Wikipedia

    en.wikipedia.org/wiki/Multiple_discovery

    [3] [4] Merton contrasted a "multiple" with a "singleton"—a discovery that has been made uniquely by a single scientist or group of scientists working together. [5] As Merton said, "Sometimes the discoveries are simultaneous or almost so; sometimes a scientist will make a new discovery which, unknown to him, somebody else has made years before."

  9. Correlation does not imply causation - Wikipedia

    en.wikipedia.org/wiki/Correlation_does_not_imply...

    This differs from the fallacy known as post hoc ergo propter hoc ("after this, therefore because of this"), in which an event following another is seen as a necessary consequence of the former event, and from conflation, the errant merging of two events, ideas, databases, etc., into one.