Where do mathematical inequalities come from?

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Discussion Overview

The discussion explores the origins and motivations behind mathematical inequalities, such as the AM-GM inequality and Bernoulli's inequality. Participants consider whether these inequalities are inspired by practical applications in fields like physics and engineering, or if they stem from a more abstract need for communication in mathematics.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions the inspirations behind inequality statements, wondering if they are influenced by fields like physics or engineering.
  • Another participant suggests that inequality statements arise from the need to communicate certain conditions or ranges of values, providing an example related to working days.
  • A participant expresses appreciation for a previous response, indicating a positive reception of the ideas presented.
  • There is a notion that mathematics serves as a language, implying that inequalities are a concise way to express relationships.
  • An example is provided illustrating how inequalities can represent working days, showing the flexibility in expressing conditions based on different starting points.

Areas of Agreement / Disagreement

Participants express various viewpoints on the motivations behind mathematical inequalities, with no clear consensus on a singular source of inspiration. The discussion remains open-ended, with multiple perspectives presented.

Contextual Notes

Some statements rely on specific interpretations of communication in mathematics and the practical applications of inequalities, which may not be universally agreed upon.

Terrell
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what do you think are the inspirations or motivations that lead to inequality statements like am-gm, bernoullie's inequality, etc...? are they inspired by physics, engineering...? learning them for the first time made me wonder where they came from. thanks!
 
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Inequality statements are inspired by the desire to communicate.
Every time you want to say that something occupies all values up to (and maybe including) a certain one, you will need an inequality statement.
Like, I am working all "days from now up to next thursday inclusive" is an inequality statement.
 
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Simon Bridge's response makes so good sense that I want to apply TWO "like"s to it but doing so only cancels the first "like".
 
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Maths is a language ... :)
 
For instance:
If d is a day in which I am working, and today is day a, and "next Thursday" is day t, then I am working: ##a\leq d \leq t##
If I start work tomorrow, instead, then ##a < d \leq t## ... it's a nice short way to write it down.
If my days are numbered (and I don't count parts of days) then ##a < d \leq t## is the same as ##a+1 \leq d \leq t## because a+1 will be the day after today.
 
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