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  2. If and only if - Wikipedia

    en.wikipedia.org/wiki/If_and_only_if

    The corresponding logical symbols are "", "", [6] and , [10] and sometimes "iff".These are usually treated as equivalent. However, some texts of mathematical logic (particularly those on first-order logic, rather than propositional logic) make a distinction between these, in which the first, ↔, is used as a symbol in logic formulas, while ⇔ is used in reasoning about those logic formulas ...

  3. Ternary conditional operator - Wikipedia

    en.wikipedia.org/wiki/Ternary_conditional_operator

    The detailed semantics of "the" ternary operator as well as its syntax differs significantly from language to language. A top level distinction from one language to another is whether the expressions permit side effects (as in most procedural languages) and whether the language provides short-circuit evaluation semantics, whereby only the selected expression is evaluated (most standard ...

  4. Necessity and sufficiency - Wikipedia

    en.wikipedia.org/wiki/Necessity_and_sufficiency

    Example 3 An occurrence of thunder is a sufficient condition for the occurrence of lightning in the sense that hearing thunder, and unambiguously recognizing it as such, justifies concluding that there has been a lightning bolt. Example 4 If the U.S. Congress passes a bill, the president's signing of the bill is sufficient to make it law.

  5. Talk:If and only if - Wikipedia

    en.wikipedia.org/wiki/Talk:If_and_only_if

    Philosophy portal; This article is within the scope of WikiProject Philosophy, a collaborative effort to improve the coverage of content related to philosophy on Wikipedia. . If you would like to support the project, please visit the project page, where you can get more details on how you can help, and where you can join the general discussion about philosophy content on Wikiped

  6. Three Hours To Change Your Life - images.huffingtonpost.com

    images.huffingtonpost.com/2013-01-04-ThreeHours...

    Year Yet questions. If you want help or explanations as you go along, turn to the chapter in PART TWO that relates to the question you're working on. 2. Read Part One and Part Two as preparation for your workshop, perhaps making notes as you read. When you've finished, set aside three hours and write your answers to the questions in Part Three.

  7. Help:Conditional tables - Wikipedia

    en.wikipedia.org/wiki/Help:Conditional_tables

    Also, this method only works with browsers supporting CSS. The code above is in {{ Conditional tables/example 2c }} . As before, the table below demonstrates the effect when it's used:

  8. Grade retention - Wikipedia

    en.wikipedia.org/wiki/Grade_retention

    Grade retention or grade repetition is the process of a student repeating a grade after failing the previous year. In the United States of America, grade retention can be used in kindergarten through to third grade; however, students in high school are usually only retained in the specific failed subject. For example, a student can be promoted ...

  9. Early childhood education - Wikipedia

    en.wikipedia.org/wiki/Early_childhood_education

    As of 2023, however, "only around 4 in 10 children aged 3 and 4 attend early childhood education" around the world. [9] Furthermore, levels of participation vary widely by region with, "around 2 in 3 children in Latin American and the Caribbean attending ECE compared to just under half of children in South Asia and only 1 in 4 in sub-Saharan ...

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