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  2. 3. Mathematics addresses only a part of human experience. Much of human experience does not fall under science or mathematics but under the philosophy of value, including ethics, aesthetics, and political philosophy. To assert that the world can be explained via mathematics amounts to an act of faith. 4.

  3. List of unsolved problems in physics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    List of unsolved problems in physics. The following is a list of notable unsolved problems grouped into broad areas of physics. [1] Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result. The others are experimental, meaning ...

  4. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    If the result of step 4 does not equal the result of step 5, then the original answer is wrong. If the two results match, then the original answer may be right, though it is not guaranteed to be. Example Assume the calculation 6,338 × 79, manually done, yielded a result of 500,702: Sum the digits of 6,338: (6 + 3 = 9, so count that as 0) + 3 ...

  5. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Do any odd weird numbers exist? Do any (2, 5)-perfect numbers exist? Do any Taxicab(5, 2, n) exist for n > 1? Is there a covering system with odd distinct moduli? Is a normal number (i.e., is each digit 0–9 equally frequent)? Are all irrational algebraic numbers normal? Is 10 a solitary number?

  6. Intelligence quotient - Wikipedia

    en.wikipedia.org/wiki/Intelligence_quotient

    An intelligence quotient ( IQ) is a total score derived from a set of standardised tests or subtests designed to assess human intelligence. [1] The abbreviation "IQ" was coined by the psychologist William Stern for the German term Intelligenzquotient, his term for a scoring method for intelligence tests at University of Breslau he advocated in ...

  7. Occam's razor - Wikipedia

    en.wikipedia.org/wiki/Occam's_razor

    Occam's razor. In philosophy, Occam's razor (also spelled Ockham's razor or Ocham's razor; Latin: novacula Occami) is the problem-solving principle that recommends searching for explanations constructed with the smallest possible set of elements. It is also known as the principle of parsimony or the law of parsimony ( Latin: lex parsimoniae ).

  8. Glossary of mathematical symbols - Wikipedia

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

    A ⊂ B {\displaystyle A\subset B} may mean that A is a proper subset of B, that is the two sets are different, and every element of A belongs to B; in formula, A ≠ B ∧ ∀ x , x ∈ A ⇒ x ∈ B {\displaystyle A eq B\land \forall {}x,\,x\in A\Rightarrow x\in B} . ⊆. A ⊆ B {\displaystyle A\subseteq B}

  9. Real number - Wikipedia

    en.wikipedia.org/wiki/Real_number

    Real number. In mathematics, a real number is a number that can be used to measure a continuous one- dimensional quantity such as a distance, duration or temperature. Here, continuous means that pairs of values can have arbitrarily small differences.

  10. What If? (book) - Wikipedia

    en.wikipedia.org/wiki/What_If?_(book)

    What If? is Munroe's second published book, his first being XKCD: Volume 0, a curated collection of xkcd comics released in 2009. [12] Munroe released a third book, titled Thing Explainer, in 2015, and a fourth book titled How To in 2019. [13] [14] A sequel, What If? 2, was announced in January 2022 and was released on September 13 that year.

  11. Interpretations of quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/Interpretations_of_quantum...

    An interpretation of quantum mechanics is an attempt to explain how the mathematical theory of quantum mechanics might correspond to experienced reality. Although quantum mechanics has held up to rigorous and extremely precise tests in an extraordinarily broad range of experiments, there exist a number of contending schools of thought over ...