Why is Linear Algebra Important and How is it Applied?

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Discussion Overview

The discussion centers around the importance and applications of linear algebra, particularly for beginners who are just starting to learn the subject. Participants explore various theoretical and practical applications, as well as clarify concepts related to linear algebra and its relevance in different contexts.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant expresses uncertainty about the importance of linear algebra compared to basic algebra and seeks examples of its applications.
  • Another participant states that the theory of linear differential equations is based on linear algebra, prompting further inquiry into what linear differential equations entail.
  • A participant poses several questions that illustrate applications of linear algebra, such as finding distances in higher dimensions, deriving closed forms for sequences, and understanding transformations in geometry.
  • One participant asks for clarification on the relationship between variables in polynomial expressions and higher dimensions, as well as how linear algebra applies to regression analysis and determinants.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the importance of linear algebra or its applications, as some express curiosity and seek clarification while others provide examples and theoretical connections. The discussion remains open-ended with multiple viewpoints presented.

Contextual Notes

Some participants may have missing assumptions about the foundational concepts of linear algebra, and there is a lack of clarity on the specific applications mentioned, such as regression analysis and the theory of linear differential equations.

Who May Find This Useful

Beginners in linear algebra, students exploring its applications in mathematics and engineering, and those interested in understanding the theoretical underpinnings of related fields such as differential equations.

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i'm just starting linear algebra and I've gone over the basics of matrixes (ex. inverces, LU decompsition, basic operators, and how to solve basic systems of equations) but i don't know why it is really important to know linear algebra so far everything I've done i could do in basic algebra in some cases i can see where is would be simpler to use linear algebra and linear program but i just was wondering what are some appelacations of linear algebra?
 
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The theory of linear differential equations is based on Linear Algebra.
 
HallsofIvy said:
The theory of linear differential equations is based on Linear Algebra.
what is the throry of linear differential equations? i know what Differential Equations are and i know what linear equations are but I'm uncleer on what linear differential equations are.
 
Ok, here are a few simple questions that linear algebra can easily deal with. Perhaps one will pique your curiosity.

If you have a plane in 3D space and a point p not on the plane, what is the shortest distance from p to the plane? What about a point and hyperplane in 4D space? 5D? 100D?

Can you find a closed form expression for the nth term of the fibonacci sequence, f(n)? The fibonacci sequence is 1 1 2 3 5 8 13 21 ... where f(n) = f(n-1) + f(n-2).

In 2D, if you flip an object about 2 different lines in succession, it is the same as doing a single rotation and no flips. Why is this? Is the same thing true for higher dimensions?

If you have a function f(x), what are the constants a0, a1, a2, ..., an such that the polynomial a0 + a1*x + a2*x^2 + ... + an*x^n gives the best approximation of f(x)?
 
this may be a dum question but are the varables x, x^2, x^3 and so forth the higher dimensions that you are talking about? and how would you use linear algebra to do ressions? right now I'm learning how to find det(A) so where dose that fit into the bigger picture of linear algebra?
 

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