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  2. Beware: 40 percent of house guests snoop around - AOL

    www.aol.com/news/2014-06-06-beware-40-percent-of...

    In 1994, the Los Angeles Times spoke with some psychologists and sociologists to better understand why people love snooping so much. According to one doctor, it's a quest to know the person better.

  3. Mathematical joke - Wikipedia

    en.wikipedia.org/wiki/Mathematical_joke

    Because 31 Oct = 25 Dec. [ 13 ] [ 14 ] The play on words lies in the similarity of the abbreviation for October/ Octal and December/Decimal, and the coincidence that both equal the same number ( 31 8 = 25 10 {\displaystyle 31_{8}=25_{10}} ).

  4. Knuth's up-arrow notation - Wikipedia

    en.wikipedia.org/wiki/Knuth's_up-arrow_notation

    The sequence starts with a unary operation (the successor function with n = 0), and continues with the binary operations of addition (n = 1), multiplication (n = 2), exponentiation (n = 3), tetration (n = 4), pentation (n = 5), etc. Various notations have been used to represent hyperoperations.

  5. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    The answer must be found one digit at a time starting at the least significant digit and moving left. ... 7+7=14 6+6=12 8+8=16 9+9=18 2+2=4; ... European Researcher ...

  6. History of mathematical notation - Wikipedia

    en.wikipedia.org/wiki/History_of_mathematical...

    Babylonian tablet (c. 1800–1600 BCE), showing an approximation of √ 2 (1 24 51 10 in sexagesimal) in the context of the Pythagorean theorem for an isosceles triangle. Written mathematics began with numbers expressed as tally marks, with each tally representing a single unit. Numerical symbols consisted probably of strokes or notches cut in ...

  7. Order of magnitude - Wikipedia

    en.wikipedia.org/wiki/Order_of_magnitude

    [contradictory] For example, the number 4 000 000 has a logarithm (in base 10) of 6.602; its order of magnitude is 6. When truncating, a number of this order of magnitude is between 10 6 and 10 7. In a similar example, with the phrase "seven-figure income", the order of magnitude is the number of figures minus one, so it is very easily ...

  8. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  9. Table of divisors - Wikipedia

    en.wikipedia.org/wiki/Table_of_divisors

    d() is the number of positive divisors of n, including 1 and n itself; σ() is the sum of the positive divisors of n, including 1 and n itselfs() is the sum of the proper divisors of n, including 1 but not n itself; that is, s(n) = σ(n) − n