Multivariable Functions and Optimization

From the study guide

Course Outline

  1. Functions of Two Variables
  2. Domains of Multivariable Functions
  3. Limits and Continuity
  4. Partial Derivatives and Differentials
  5. Second Partial Derivatives
  6. Homogeneous Functions
  7. Euler Theorem and Production
  8. Jacobian Matrix
  9. Unconstrained Extrema
  10. Equality-Constrained Optimization

1. Functions of Two Variables

Key Concepts & Definitions

  • Function of Two Variables: assigns a unique real number f(x,y) to each ordered pair (x,y) in its domain D

Essential Points

  • An n-tuple (x₁,x₂,…,xₙ) is an ordered set of n elements used as the input of a function of several variables.

2. Domains of Multivariable Functions

Key Concepts & Definitions

  • Function Domain: the subset of ℝ² containing every ordered pair for which the function is defined

Essential Points

  • For f₁(x,y)=(-x²+y³-5)/(x-1), the domain is Df1={(x,y)∈R2∣x≠1}D_{f_1}=\{(x,y)\in\mathbb{R}^2\mid x\ne1\} because the denominator cannot be zero.

3. Limits and Continuity

Key Concepts & Definitions

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Practice quiz preview

1. What does a function of two variables assign to each ordered pair in its domain?

2. Which expression represents an ordered set of n input elements for a function of several variables?

3. Which set describes the domain of a multivariable function?

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Flashcard preview

What does a function of two variables assign to each ordered pair (x,y)?

A unique real number f(x,y).

What is an n-tuple in the context of functions of several variables?

An ordered set of n elements used as input.

What is the domain of a multivariable function?

The subset of ℝ² where the function is defined.

Why is the domain of f1(x,y)=−x2+y3−5x−1f_1(x,y)=\frac{-x^2+y^3-5}{x-1} all pairs with x≠1x \ne 1?

Because the denominator cannot be zero.

Function of Two Variables - Definition

Assigns a real number to each (x,y) in its domain.

Domain of Function

Subset of ℝ² where function is defined.

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Frequently asked questions

What does the Multivariable Functions and Optimization study guide cover?

It covers the core concepts of Multivariable Functions and Optimization, organized by topic with the key definitions, explanations and takeaways, so it's easier to learn and remember.

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How many questions are in the Multivariable Functions and Optimization quiz?

The practice quiz has 10 multiple-choice questions, each with an explanation. Use it to check what you know and find your gaps.

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How do I study Multivariable Functions and Optimization with flashcards?

There are 11 flashcards on Multivariable Functions and Optimization, with a question on the front and the answer on the back. Try to recall each answer before you flip, and let spaced repetition bring back the ones you miss.

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