Model Question Paper CST 292 Number Theory

 

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Introduction

Welcome to the fascinating world of number theory! Number theory is a branch of pure mathematics that deals with the properties and relationships of numbers. It's one of the oldest branches of mathematics, dating back to ancient times, and it continues to be a vibrant and active field of research today. At its core, number theory focuses on the study of integers and their properties. Integers are whole numbers, including positive numbers, negative numbers, and zero. Number theorists explore various aspects of these integers, seeking patterns, relationships, and structures within the numerical realm. One of the central themes in number theory is prime numbers. Prime numbers are integers greater than 1 that have no positive divisors other than 1 and themselves. They play a fundamental role in number theory and are often considered the building blocks of the integers. The distribution and properties of prime numbers have intrigued mathematicians for centuries and continue to be a ...
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Modular Arithmetic

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Modular arithmetic is a fascinating branch of mathematics that deals with numbers “wrapping around” when they reach a certain value, known as the modulus. Here are the key concepts: Definition: In modular arithmetic, we work with integers and consider their remainders when divided by a fixed quantity (the modulus). Think of it like a clock: after reaching 12 hours, the clock “wraps around” to 1. The modern approach to modular arithmetic was developed by Carl Friedrich Gauss The Modulus If $a$  is an integer and $n$ is a positive integer, we define $ a \: mod \: n $ to be the remainder when $a$ is divided by $n$ . The integer is called the modulus. Thus, for any integer , $$a = qn+r \quad  0 \le r \lt n \quad q=\lfloor a/n \rfloor$$ $$r= a - \lfloor a/n \rfloor .n $$ Example: $11 \: \mod \: 7 =4$ and $-11 \: \mod  \: 7=3$ Two integers $a$ and $b$ are  said to congruent modulo  $n$, if $a \: \mod \: n= b \: \mod \: n$.This is written as $$a \equiv b (\mod...
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Group Ring Field

  Groups : A  group  is a mathematical structure that consists of a set of elements along with an operation (usually called  addition  or  multiplication ). Key properties of a group: Closure: The result of the operation on any two elements in the group remains within the group. Associativity: The operation is associative (i.e., the order of performing the operation doesn’t matter). Identity element: There exists an element (often denoted as  e ) such that combining it with any other element doesn’t change the other element. Inverse element: Each element has an inverse (opposite) element within the group. Example: The integers under addition form a group. Rings : A  ring  is a more general structure than a group. It includes both  addition  and  multiplication  operations. Key properties of a ring: Closure under addition and multiplication. Associativity of both operations. Distributive property: Multiplication distributes...
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