Does one need to know elementary number theory to study Abstract Algebra?

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Discussion Overview

The discussion revolves around the necessity of knowledge in elementary number theory for studying abstract algebra, particularly in the context of solving problems from Herstein's textbook. Participants explore whether prior understanding of number theory is essential for tackling various levels of problems presented in the book.

Discussion Character

  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant suggests that many exercises in Herstein's problems relate to number theory and that a background in naive number theory may be beneficial for solving harder problems.
  • Another participant argues that there is no need for knowledge of even basic number theory to study abstract algebra, stating that problems in Herstein do not require it and that modular arithmetic should not be considered part of number theory.
  • A third participant challenges the dismissive view of number theory, referencing Gauss and emphasizing the depth and significance of higher arithmetic in mathematics.
  • Another participant asserts that all necessary knowledge for the exercises in Herstein is contained within the book itself, implying no external number theory knowledge is required.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of number theory for studying abstract algebra. Some believe it is essential for understanding harder problems, while others contend that it is not required at all. The discussion remains unresolved with multiple competing perspectives.

Contextual Notes

Participants reference varying interpretations of what constitutes necessary knowledge for abstract algebra, particularly regarding the role of modular arithmetic and its relation to number theory. There is also a divergence in opinions on the significance of number theory in the broader context of mathematics.

AdrianZ
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It's been some time that I've been studying abstract algebra and now I'm trying to solve baby Herstein's problems, the thing I have noticed is that many of the exercises are related to number theory in someway and solving them needs a previous knowledge or a background of elementary number theory. Do I need to study naive number theory before I start solving 'Harder' Problems of Herstein? I think Easier and Middle-Level problems can be solved by reading only the book itself, but what about harder problems?
 
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No, I can think of no reason why one should need to know even basic "number theory" in order to study abstract algebra. I do not know of any problems in Herstein that require number theory. Many simple examples in abstract algebra can be given in terms of "modular arithmetic" but I would not consider that to be contained in number theory.

(Number theory itself is a rather limited study- not nearly as much used in other forms of mathematics as abstract algebra.)
 
@HallsofIvy:

You may be a bit too dismissive of number theory. Gauss, "inventor" of modular arithmetic, would certainly think so:

"The most beautiful theorems of higher arithmetic have this peculiarity, that they are easily discovered by induction, while on the other hand their demonstrations lie in exceeding obscurity and can be ferreted out only by very searching investigations. It is precisely this which gives to higher arithmetic the magic charm which has made it the favorite science of leading mathematicians, not to mention its inexhaustible richness, wherein it so far excels all other parts of mathematics."
 
No, you don't need any knowledge about number theory to tackle Herstein. Everything you need for the exercises will be covered in the book.
 

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