Inequality

Definition

Inequality refers to the state of being unequal or the lack of equality, particularly in the distribution or balance of something. In the context of calculus, inequality is a fundamental concept that describes the comparative relationship between two or more mathematical expressions or quantities.

5 Must Know Facts For Your Next Test

1. Inequalities are used to compare the relative magnitudes of mathematical expressions, such as algebraic expressions, functions, or variables.
2. Inequalities can be used to represent constraints, limitations, or ranges of values in various mathematical and real-world applications.
3. Solving inequalities involves finding the set of values that satisfy the given inequality, which may involve techniques such as algebraic manipulation, graphing, or using properties of inequalities.
4. Inequalities play a crucial role in the Comparison Tests, which are used to determine the convergence or divergence of infinite series.
5. Understanding the properties and behavior of inequalities is essential for working with limits, sequences, and series in calculus.

Review Questions

• Explain the difference between strict and weak inequalities, and provide examples of each.
  • Strict inequalities, such as '$x > 3$' or '$y < 2$', indicate that one expression is strictly greater than or less than the other. Weak inequalities, such as '$a ≥ 5$' or '$b ≤ 7$', indicate that one expression is greater than or equal to, or less than or equal to, the other. Strict inequalities exclude the endpoints, while weak inequalities include the endpoints. For example, the interval '(2, 5]' represents the set of values greater than 2 and less than or equal to 5, while the interval '[3, 8)' represents the set of values greater than or equal to 3 and less than 8.
• Describe how inequalities are used in the Comparison Tests for infinite series, and explain the significance of these tests.
  • The Comparison Tests, including the Comparison Test, the Limit Comparison Test, and the Integral Test, rely on the use of inequalities to determine the convergence or divergence of infinite series. These tests involve comparing the given series to a known convergent or divergent series, using inequalities to establish a relationship between the terms of the two series. The Comparison Tests are essential in calculus because they provide a systematic way to analyze the behavior of infinite series, which are fundamental in the study of limits, sequences, and series.
• Analyze the role of interval notation in representing and working with inequalities, and explain how it can be used to solve problems involving inequalities.
  • Interval notation is a concise and powerful way to represent the set of values that satisfy a given inequality. By using brackets and parentheses to indicate whether the endpoints are included or excluded, interval notation allows for a clear and unambiguous representation of the solution set. This representation is particularly useful when working with inequalities, as it enables you to visualize the range of values that satisfy the inequality and facilitates the analysis of problems involving inequalities. For example, the interval '[2, 5]' represents the set of values greater than or equal to 2 and less than or equal to 5, while the interval '(3, 8)' represents the set of values greater than 3 and less than 8. Understanding interval notation and its connection to inequalities is crucial for solving a variety of problems in calculus, such as those involving limits, sequences, and series.

Related terms

Strict Inequality: A strict inequality is a comparison between two expressions or quantities where one is strictly greater than or less than the other, denoted by the symbols '>' or '<'.

Weak Inequality: A weak inequality is a comparison between two expressions or quantities where one is greater than or equal to, or less than or equal to, the other, denoted by the symbols '≥' or '≤'.

Interval Notation: Interval notation is a way to represent the set of values that satisfy an inequality, using brackets and parentheses to indicate whether the endpoints are included or excluded.