Math 2.0

definition

Set bounded above

Definition

Let (P,≤)(P, \le) be a partially ordered set and let SS be a subset of PP. An element MM of PP is an upper bound of SS when s≤Ms \le M for each ss in SS. The set SS is bounded above when it has at least one upper bound in PP. Similarly, mm is a lower bound of SS when m≤sm \le s for each ss in SS. The set SS is bounded below when it has a lower bound.

Remarks

In R\mathbb{R}, the interval [0,1)[0, 1) is bounded above. Each number M≥1M \ge 1 is an upper bound. The set N\mathbb{N} is not bounded above in R\mathbb{R}, by the Archimedean property. An upper bound of SS does not need to be an element of SS.

Explanations

L1 human

A set is bounded above when it does not go up forever: some number is a ceiling for all its elements. The set {1,1/2,1/3,… }\{1, 1/2, 1/3, \dots\} is bounded above by 11, and also by 22 and by 100100.

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Sources

  1. Web https://en.wikipedia.org/wiki/Upper_and_lower_bounds, lead section