Prove or disprove the following. (a) The set of all subsets of R form a group under the operation N. (b) For any sets X, Y , and any functions f:X →Y,g: Y → X, if fog is injective, then so is g o f. (c) There are exactly 5 distinct equivalence relations on the set {1,2,3}.
Percentage
A percentage is a number indicated as a fraction of 100. It is a dimensionless number often expressed using the symbol %.
Algebraic Expressions
In mathematics, an algebraic expression consists of constant(s), variable(s), and mathematical operators. It is made up of terms.
Numbers
Numbers are some measures used for counting. They can be compared one with another to know its position in the number line and determine which one is greater or lesser than the other.
Subtraction
Before we begin to understand the subtraction of algebraic expressions, we need to list out a few things that form the basis of algebra.
Addition
Before we begin to understand the addition of algebraic expressions, we need to list out a few things that form the basis of algebra.
Abstract algebra problem:
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