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extremal

C2

Pronunciation

UK

  • /ɪkstrˈɛməl/

US

  • /ɛkstrˈɛməl/

Description

"Extremal" is not a word you hear every day, but it has a clear job. It describes something that is at an extreme point, or something connected to the largest or smallest possible value. Think of the very top, the very bottom, or the outer edge of what is allowed. The word appears most often in mathematics, physics, and similar fields. A mathematician might talk about "extremal points" on a curve, meaning the points where a function reaches its highest or lowest value. You may also see it in phrases like "extremal problem," where the goal is to find the best, smallest, or largest result under certain limits.

Imagine a graph rising and falling like a range of hills. The highest peak and the lowest dip are the places this word points to. It is less about strong emotion and more about being at the edge of a range.

Examples

  1. 1

    Optimization problem

    The chapter opens with an extremal problem: which shape encloses the largest area for a fixed perimeter?

  2. 2

    Proof strategy

    In the proof, we start with an extremal example and show that it cannot actually exist.

    • Domain

      an extremal example

      one chosen because it is the largest, smallest, or otherwise most extreme case

  3. 3

    Graph theory

    Her research is in extremal graph theory, a branch of math that studies the largest possible networks that avoid certain patterns.

Forms and spellings

1 form open this card.

Main spelling

  • extremal