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  2. Mathematical proof - Wikipedia

    en.wikipedia.org/wiki/Mathematical_proof

    The proof is written as a series of lines in two columns. In each line, the left-hand column contains a proposition, while the right-hand column contains a brief explanation of how the corresponding proposition in the left-hand column is either an axiom, a hypothesis, or can be logically derived from previous propositions.

  3. Cramer's rule - Wikipedia

    en.wikipedia.org/wiki/Cramer's_rule

    The proof for Cramer's rule uses the following properties of the determinants: linearity with respect to any given column and the fact that the determinant is zero whenever two columns are equal, which is implied by the property that the sign of the determinant flips if you switch two columns.

  4. List of incomplete proofs - Wikipedia

    en.wikipedia.org/wiki/List_of_incomplete_proofs

    The proof was completed by Werner Ballmann about 50 years later. Littlewood–Richardson rule. Robinson published an incomplete proof in 1938, though the gaps were not noticed for many years. The first complete proofs were given by Marcel-Paul Schützenberger in 1977 and Thomas in 1974. Class numbers of imaginary quadratic fields.

  5. List of long mathematical proofs - Wikipedia

    en.wikipedia.org/wiki/List_of_long_mathematical...

    Hejhal's proof of a general form of the Selberg trace formula consisted of 2 volumes with a total length of 1322 pages. Arthur–Selberg trace formula. Arthur's proofs of the various versions of this cover several hundred pages spread over many papers. 2000 Almgren's regularity theorem. Almgren's proof was 955 pages long.

  6. Propositional calculus - Wikipedia

    en.wikipedia.org/wiki/Propositional_calculus

    A proof, then, laid out in accordance with the Suppes–Lemmon notation style, [43] is a sequence of lines containing sentences, [38] where each sentence is either an assumption, or the result of applying a rule of proof to earlier sentences in the sequence. [38]

  7. Difference of two squares - Wikipedia

    en.wikipedia.org/wiki/Difference_of_two_squares

    By the commutative law, the middle two terms cancel: = leaving (+) = The resulting identity is one of the most commonly used in mathematics. Among many uses, it gives a simple proof of the AM–GM inequality in two variables. The proof holds in any commutative ring.

  8. Walmart accused of illegally opening costly accounts for drivers

    www.aol.com/walmart-accused-illegally-opening...

    The CFPB alleges in its suit that the two firms violated federal law for two years starting in 2021. The company and Branch are accused of using drivers' information, including their Social ...

  9. Double counting (proof technique) - Wikipedia

    en.wikipedia.org/wiki/Double_counting_(proof...

    A divisibility proof by double counting: for any prime and natural number , there are length-words over an -symbol alphabet having two or more distinct symbols. These may be grouped into sets of p {\displaystyle p} words that can be transformed into each other by circular shifts ; these sets are called necklaces .

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