Types of Numbers and Their Properties

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Questions and Answers

What are imaginary numbers?

  • Numbers with points on a number line
  • Square roots of negative numbers, no points on a number line (correct)
  • Only negative numbers
  • Only positive numbers

What type of numbers have points on a number line?

  • Imaginary numbers
  • Real numbers (correct)
  • Irrational numbers
  • None of the above

What are negative numbers?

Numbers less than 0

What are positive numbers?

<p>Numbers greater than 0</p>
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What is zero?

<p>Neither positive nor negative</p>
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What are rational numbers?

<p>Can be expressed exactly as a ratio of two integers</p>
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What are irrational numbers?

<p>Cannot be expressed as a ratio of two integers but are real numbers</p>
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What are radicals?

<p>Involves square root, cube root, etc., of integers</p>
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What are transcendental numbers?

<p>Cannot be expressed as roots of integers</p>
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What are integers?

<p>Whole numbers and their opposites</p>
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What are nonintegers?

<p>Fractions, numbers between integers</p>
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What are natural/counting numbers?

<p>Positive integers</p>
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What are digits?

<p>0, 1, 2, 3, 4, 5, 6, 7, 8, 9</p>
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What are even numbers?

<p>Integers divisible by 2</p>
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What are odd numbers?

<p>Integers not divisible by 2</p>
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What are axioms?

<p>Mathematical properties</p>
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What are polynomials?

<p>Algebraic expressions that involve +, -, x of variables</p>
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What is the degree of a polynomial?

<p>Maximum number of variables that appear as factors in any one term</p>
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What is an extraneous solution?

<p>Number which satisfies a transformed equation, but not the original equation</p>
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What is the reflexive property?

<p>x = x</p>
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What is symmetry in mathematics?

<p>If x = y, then y = x</p>
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What is transitivity in mathematics?

<p>If x = y and y = z, then x = z</p>
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What is trichotomy?

<p>If x and y are real numbers, then exactly one of the following are true: x &gt; y, y &gt; x, or x = y</p>
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What is a lemma?

<p>Minor result whose sole purpose is to help in proving harder theorems</p>
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What is a theorem?

<p>Mathematical statement that is proved to be true before using in math</p>
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What does 'or' mean in an equation?

<p>Equation is greater (or equal to) x or (equal to or) less than negative x</p>
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What does 'and' mean in an equation?

<p>Equation is (equal to or) less than x or greater (or equal to) than -x</p>
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Study Notes

Imaginary and Real Numbers

  • Imaginary numbers are square roots of negative numbers with no corresponding points on the number line.
  • Real numbers have defined locations on the number line and include all rational and irrational numbers.

Types of Numbers

  • Negative numbers are values less than zero; examples include -1 or -5.
  • Positive numbers are values greater than zero; examples include 1 or 7.
  • Zero is a unique number that is neither positive nor negative.

Rational and Irrational Numbers

  • Rational numbers can be expressed as a ratio of two integers; examples include 1/2, 2, or -6/12.
  • Irrational numbers cannot be expressed as a ratio of integers but are real; examples include √5 and Ï€.

Radicals and Transcendental Numbers

  • Radicals involve square roots, cube roots, etc., of integers; for instance, √5.
  • Transcendental numbers cannot be expressed as the root of any integer; Ï€ is a primary example.

Integer and Non-Integer Types

  • Integers encompass whole numbers and their negatives, such as 2 and -2.
  • Nonintegers include fractions or numbers that fall between integers, e.g., 3/4 and -7/10.

Natural and Counting Numbers

  • Natural (counting) numbers are the set of positive integers starting from 1.

Number Classification

  • Digits range from 0 to 9, forming the basis of numerals.
  • Even numbers are integers divisible by 2, such as 2 and -4.
  • Odd numbers are integers not divisible by 2, such as 3 and -5.

Mathematical Properties

  • Axioms are fundamental mathematical properties like closure, commutativity, associativity, identity elements, inverses, and distributivity.

Polynomials

  • Polynomials are algebraic expressions formed by the addition, subtraction, or multiplication of variables.
  • Types of polynomials based on the number of terms include monomial (1 term), binomial (2 terms), trinomial (3 terms), and polynomial (4 or more terms).

Degree of Polynomial

  • The degree of a polynomial indicates the highest number of variables as factors in any term.
  • Degrees include: 0 (constant), 1 (linear), 2 (quadratic), 3 (cubic), 4 (quartic), and 5 (quintic).

Solutions and Properties

  • An extraneous solution satisfies a transformed equation but not the original.
  • The reflexive property asserts that any number is equal to itself (x = x).
  • Symmetry states that if x equals y, then y equals x.
  • Transitivity defines equality as if x = y and y = z, then x = z; and for order, if x > y and y > z, then x > z.
  • Trichotomy states that for real numbers x and y, one and only one of the conditions holds: x > y, y > x, or x = y.

Theorems and Logical Connectives

  • A lemma serves as a minor result aiding in the proof of more complex theorems.
  • A theorem is a proven mathematical statement applicable in further calculations.
  • The logical connective Or allows for possibilities where an equation is greater than or equal to x or less than or equal to -x.
  • The logical connective And constrains an equation to being less than or equal to x or greater than or equal to -x.

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