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  2. Aleph number - Wikipedia

    en.wikipedia.org/wiki/Aleph_number

    The aleph numbers differ from the infinity (∞) commonly found in algebra and calculus, in that the alephs measure the sizes of sets, while infinity is commonly defined either as an extreme limit of the real number line (applied to a function or sequence that "diverges to infinity" or "increases without bound"), or as an extreme point of the ...

  3. List of logic symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_logic_symbols

    The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics. Additionally, the subsequent columns contains an informal explanation, a short example, the Unicode location, the name for use in HTML documents, [1] and the LaTeX symbol.

  4. Glossary of mathematical symbols - Wikipedia

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

    1. Means "less than or equal to". That is, whatever A and B are, A ≤ B is equivalent to A < B or A = B. 2. Between two groups, may mean that the first one is a subgroup of the second one. ≥ 1. Means "greater than or equal to". That is, whatever A and B are, A ≥ B is equivalent to A > B or A = B. 2.

  5. Question mark - Wikipedia

    en.wikipedia.org/wiki/Question_mark

    When placed above the relational symbol in an equation or inequality, a question-mark annotation means that the stated relation is "questioned". This can be used to ask whether the relation might be true or to point out the relation's possible invalidity. U+225F ≟ QUESTIONED EQUAL TO; U+2A7B ⩻ LESS-THAN WITH QUESTION MARK ABOVE

  6. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Because zero itself has no sign, neither the positive numbers nor the negative numbers include zero. When zero is a possibility, the following terms are often used: Non-negative numbers: Real numbers that are greater than or equal to zero. Thus a non-negative number is either zero or positive. Non-positive numbers: Real numbers that are less ...

  7. Infinity symbol - Wikipedia

    en.wikipedia.org/wiki/Infinity_symbol

    The infinity symbol (∞) is a mathematical symbol representing the concept of infinity. This symbol is also called a lemniscate , [ 1 ] after the lemniscate curves of a similar shape studied in algebraic geometry , [ 2 ] or "lazy eight", in the terminology of livestock branding .

  8. Infinity - Wikipedia

    en.wikipedia.org/wiki/Infinity

    Infinity is something which is boundless, endless, or larger than any natural number. It is denoted by , the infinity symbol. From the time of the ancient Greeks, the philosophical nature of infinity has been the subject of many discussions among philosophers.

  9. Beth number - Wikipedia

    en.wikipedia.org/wiki/Beth_number

    Because of Cantor's theorem, each set in the preceding sequence has cardinality strictly greater than the one preceding it. For infinite limit ordinals λ {\displaystyle \lambda } , the corresponding beth number is defined to be the supremum of the beth numbers for all ordinals strictly smaller than λ {\displaystyle \lambda } :