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  2. Order of operations - Wikipedia

    en.wikipedia.org/wiki/Order_of_operations

    The acronym's procedural application does not match experts' intuitive understanding of mathematical notation: mathematical notation indicates groupings in ways other than parentheses or brackets and a mathematical expression is a tree-like hierarchy rather than a linearly "ordered" structure; furthermore, there is no single order by which ...

  3. Contraposition - Wikipedia

    en.wikipedia.org/wiki/Contraposition

    The inverse is "If a polygon is not a quadrilateral, then it does not have four sides." In this case, unlike the last example, the inverse of the statement is true. The converse is "If a polygon has four sides, then it is a quadrilateral." Again, in this case, unlike the last example, the converse of the statement is true.

  4. List of logic symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_logic_symbols

    material conditional (material implication) implies, if P then Q, it is not the case that P and not Q propositional logic, Boolean algebra, Heyting algebra: is false when A is true and B is false but true otherwise.

  5. Exception that proves the rule - Wikipedia

    en.wikipedia.org/wiki/Exception_that_proves_the_rule

    The exception proves the rule is a phrase that arises from ignorance, though common to good writers. The original word was preuves, which did not mean proves but tests. [4] In this sense, the phrase does not mean that an exception demonstrates a rule to be true or to exist, but that it tests the rule, thereby proving its value.

  6. Necessity and sufficiency - Wikipedia

    en.wikipedia.org/wiki/Necessity_and_sufficiency

    The assertion that Q is necessary for P is colloquially equivalent to "P cannot be true unless Q is true" or "if Q is false, then P is false". [9] [1] By contraposition, this is the same thing as "whenever P is true, so is Q". The logical relation between P and Q is expressed as "if P, then Q" and denoted "P ⇒ Q" (P implies Q).

  7. Conditional (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Conditional_(computer...

    If-then-else flow diagram A nested if–then–else flow diagram. In computer science, conditionals (that is, conditional statements, conditional expressions and conditional constructs) are programming language constructs that perform different computations or actions or return different values depending on the value of a Boolean expression, called a condition.

  8. Pamela Anderson 'Didn't Realize How Difficult' It Was for Her ...

    www.aol.com/pamela-anderson-didnt-realize...

    Pamela Anderson is reflecting on the "difficult" combination of her image as a Hollywood star and, simultaneously, a mother, earlier in her career. But when it comes to her sons Brandon, now 28 ...

  9. Than - Wikipedia

    en.wikipedia.org/wiki/Than

    Than is a grammatical particle analyzed as both a conjunction and a preposition in the English language. It introduces a comparison and is associated with comparatives and with words such as more , less , and fewer .