Solving Linear Systems with "m Equations & n Unknowns

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Discussion Overview

The discussion revolves around the terminology used to describe a linear system, specifically the phrasing "m equations in n unknowns" versus "n unknowns in m equations." Participants explore the implications of this phrasing and its clarity in mathematical contexts.

Discussion Character

  • Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions whether the phrasing should be reversed, suggesting that "n unknowns in m equations" might be more intuitive.
  • Another participant argues that the distinction is irrelevant as long as m and n are clearly defined.
  • Some participants propose that the phrasing may reflect language differences, with the first form being more natural in English and the latter in other languages.
  • One participant suggests rephrasing to "m equations with n unknowns," while agreeing that both forms convey the same meaning.
  • Another participant notes that standard convention associates a matrix of size $m \times n$ with $m$ equations and $n$ variables, reinforcing the original phrasing.

Areas of Agreement / Disagreement

Participants generally agree that both phrasings convey the same concept, but there is some disagreement regarding which form is more appropriate or intuitive.

Contextual Notes

There may be assumptions about the audience's familiarity with mathematical terminology and conventions that are not explicitly stated.

delgeezee
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My book describes a linear system with "m equations in n unknowns."

Maybe this is a subtle detail but this confuses me. Shouldn't it be the other way around, "n unknowns in m equations?"
 
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Re: terminology

It makes no difference, so long as m and n are defined.
 
Re: terminology

They both mean the same thing as far as I can tell. I think this may be a language problem, the first form might be more natural in english whereas the other sounds more natural in other languages (for instance french).​
 
Re: terminology

I'd write the first form as "m equations with n unknowns."
Anyway, the two forms mean the same thing.
 
Re: terminology

Like others said the variable names can be whatever you want to use, but standard convention is that a matrix of size $m \times n$ corresponds to a linear system of equations, which means that there are $m$ rows and $n$ columns. That corresponds to $m$ equations and $n$ variables.
 

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