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  2. Expression (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Expression_(mathematics)

    In the equation 7x − 5 = 2, the sides of the equation are expressions. In mathematics, an expression is a written arrangement of symbols following the context-dependent, syntactic conventions of mathematical notation. Symbols can denote numbers, variables, operations, and functions. [1]

  3. Proof by contradiction - Wikipedia

    en.wikipedia.org/wiki/Proof_by_contradiction

    A typical example is the proof of the proposition "there is no smallest positive rational number": assume there is a smallest positive rational number q and derive a contradiction by observing that ⁠ q / 2 ⁠ is even smaller than q and still positive.

  4. Indirect self-reference - Wikipedia

    en.wikipedia.org/wiki/Indirect_self-reference

    An indirectly self-referential sentence would replace the phrase "this sentence" with an expression that effectively still referred to the sentence, but did not use the pronoun "this." An example will help to explain this. Suppose we define the quine of a phrase to be the quotation of the phrase followed by the phrase itself. So, the quine of:

  5. List of rules of inference - Wikipedia

    en.wikipedia.org/wiki/List_of_rules_of_inference

    Examples: The column-14 operator (OR), shows Addition rule : when p =T (the hypothesis selects the first two lines of the table), we see (at column-14) that p ∨ q =T. We can see also that, with the same premise, another conclusions are valid: columns 12, 14 and 15 are T.

  6. Glossary of mathematical jargon - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    A reference to a standard or choice-free presentation of some mathematical object (e.g., canonical map, canonical form, or canonical ordering). The same term can also be used more informally to refer to something "standard" or "classic". For example, one might say that Euclid's proof is the "canonical proof" of the infinitude of primes.

  7. Free indirect speech - Wikipedia

    en.wikipedia.org/wiki/Free_indirect_speech

    Free indirect discourse can be described as a "technique of presenting a character's voice partly mediated by the voice of the author". In the words of the French narrative theorist Gérard Genette, "the narrator takes on the speech of the character, or, if one prefers, the character speaks through the voice of the narrator, and the two instances then are merged". [1]

  8. List of mathematical functions - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_functions

    Quintic function: Fifth degree polynomial. Rational functions: A ratio of two polynomials. nth root. Square root: Yields a number whose square is the given one. Cube root: Yields a number whose cube is the given one.

  9. Indirect speech - Wikipedia

    en.wikipedia.org/wiki/Indirect_speech

    The indirect speech sentence is then ambiguous since it can be a result of two different direct speech sentences. For example: I can get it for free. OR I could get it for free. He said that he could get it for free. (ambiguity) However, in many Slavic languages, there is no change of tense in indirect speech and so there is no ambiguity.

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