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  2. 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 .

  3. Table of mathematical symbols by introduction date - Wikipedia

    en.wikipedia.org/wiki/Table_of_mathematical...

    infinity sign 1655 ... set inclusion signs (subset of, superset of) 1817 Joseph Gergonne: 1890 ... end of proof sign (a.k.a. tombstone) 1950 [5]

  4. Infinity - Wikipedia

    en.wikipedia.org/wiki/Infinity

    At the end of the 19th century, Georg Cantor enlarged the mathematical study of infinity by studying infinite sets and infinite numbers, showing that they can be of various sizes. [1] [3] For example, if a line is viewed as the set of all of its points, their infinite number (i.e., the cardinality of the line) is larger than the number of ...

  5. End (topology) - Wikipedia

    en.wikipedia.org/wiki/End_(topology)

    The set of ends of any compact space is the empty set. The real line has two ends. For example, if we let K n be the closed interval [−n, n], then the two ends are the sequences of open sets U n = (n, ∞) and V n = (−∞, −n). These ends are usually referred to as "infinity" and "minus infinity", respectively.

  6. Glossary of mathematical symbols - Wikipedia

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

    (infinity symbol) 1. The symbol is read as infinity. As an upper bound of a summation, an infinite product, an integral, etc., means that the computation is unlimited. Similarly, in a lower bound means that the computation is not limited toward negative values. 2.

  7. Wrench - Wikipedia

    en.wikipedia.org/wiki/Wrench

    A set of metric spanners or wrenches, open at one end and box/ring at the other. These are commonly known as “combination” spanners. A wrench or spanner is a tool used to provide grip and mechanical advantage in applying torque to turn objects—usually rotary fasteners, such as nuts and bolts—or keep them from turning.

  8. 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 ...

  9. Interval (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Interval_(mathematics)

    The union of two intervals is an interval if and only if they have a non-empty intersection or an open end-point of one interval is a closed end-point of the other, for example (,) [,] = (,]. If R {\displaystyle \mathbb {R} } is viewed as a metric space , its open balls are the open bounded intervals ( c + r , c − r ) , and its closed balls ...

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