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  2. 1+1 - Wikipedia

    en.wikipedia.org/wiki/1+1

    1+1 is a mathematical expression that evaluates to: 2 (number) (in ordinary arithmetic) ... The terms 1+1, One Plus One, or One and One may refer to: 1+1.

  3. 1 - Wikipedia

    en.wikipedia.org/wiki/1

    1 (one, unit, unity) is a number, numeral, and glyph.It is the first and smallest positive integer of the infinite sequence of natural numbers.This fundamental property has led to its unique uses in other fields, ranging from science to sports, where it commonly denotes the first, leading, or top thing in a group. 1 is the unit of counting or measurement, a determiner for singular nouns, and a ...

  4. 0.999... - Wikipedia

    en.wikipedia.org/wiki/0.999...

    For example, in base 2 (the binary numeral system) 0.111... equals 1, and in base 3 (the ternary numeral system) 0.222... equals 1. In general, any terminating base expression has a counterpart with repeated trailing digits equal to − 1. Textbooks of real analysis are likely to skip the example of 0.999... and present one or both of these ...

  5. Principia Mathematica - Wikipedia

    en.wikipedia.org/wiki/Principia_Mathematica

    The ramified type (τ 1,...,τ m |σ 1,...,σ n) can be modeled as the product of the type (τ 1,...,τ m,σ 1,...,σ n) with the set of sequences of n quantifiers (∀ or ∃) indicating which quantifier should be applied to each variable σ i. (One can vary this slightly by allowing the σs to be quantified in any order, or allowing them to ...

  6. Infinity plus one - Wikipedia

    en.wikipedia.org/wiki/Infinity_plus_one

    In mathematics, infinity plus one is a concept which has a well-defined formal meaning in some number systems, and may refer to: Transfinite numbers, numbers that are larger than all the finite numbers. Cardinal numbers, representations of sizes (cardinalities) of abstract sets, which may be infinite.

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  8. Equals sign - Wikipedia

    en.wikipedia.org/wiki/Equals_sign

    The equals sign (British English) or equal sign (American English), also known as the equality sign, is the mathematical symbol =, which is used to indicate equality in some well-defined sense. [1] In an equation, it is placed between two expressions that have the same value, or for which one studies the conditions under which they have the ...

  9. History of mathematical notation - Wikipedia

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

    For example, the rhetorical form of + = is "The thing plus one equals two" or possibly "The thing plus 1 equals 2". [citation needed] The ancient Egyptians numerated by hieroglyphics. [12] [13] Egyptian mathematics had symbols for one, ten, one hundred, one thousand, ten thousand, one hundred thousand, and one million. Smaller digits were ...