Definition of differential equation

Click For Summary
SUMMARY

A differential equation is defined as an equation that includes the derivatives of one or more unknown functions, referred to as dependent variables, with respect to one or more independent variables. In this context, a dependent variable is one whose derivative is present in the equation, while an independent variable does not depend on other variables. For example, in the expression $$\frac{dy}{dx}$$, $y$ is the dependent variable and $x$ is the independent variable. Understanding these distinctions is crucial for solving differential equations effectively.

PREREQUISITES
  • Understanding of basic calculus concepts, including derivatives.
  • Familiarity with the terminology of independent and dependent variables.
  • Knowledge of mathematical notation used in differential equations.
  • Basic problem-solving skills in algebra and calculus.
NEXT STEPS
  • Study the different types of differential equations, such as ordinary and partial differential equations.
  • Learn techniques for solving first-order differential equations.
  • Explore applications of differential equations in physics and engineering.
  • Investigate numerical methods for approximating solutions to complex differential equations.
USEFUL FOR

Students of mathematics, educators teaching calculus, and professionals in fields requiring mathematical modeling, such as physics and engineering, will benefit from this discussion on differential equations.

find_the_fun
Messages
147
Reaction score
0
My textbook defines differential equation as

an equation containing the derivatives of one or more unknown functions(or dependent variables), with respect to one or more independent variables.

Could someone explain what is meant by the part in parenthesis "dependent variables"? I don't see the difference.
 
Physics news on Phys.org
find_the_fun said:
My textbook defines differential equation as
Could someone explain what is meant by the part in parenthesis "dependent variables"? I don't see the difference.

When a differential equation involves one or more derivatives with respect to a particular variable, that variable is called the independent variable.

A variable is called dependent if a derivative of that variable occurs.

When $y = y(x)$ is an unknown function in respect to $x$, $y$ is a dependent variable and $x$ an independent variable.
 
mathmari said:
When a differential equation involves one or more derivatives with respect to a particular variable, that variable is called the independent variable.
So in the case $$\frac{dy}{dx}$$ the$$ x$$ is referred to as the independent variable?
 
find_the_fun said:
So in the case $$\frac{dy}{dx}$$ the$$ x$$ is referred to as the independent variable?

Yes, that's right!
 

Similar threads

  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 19 ·
Replies
19
Views
3K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 52 ·
2
Replies
52
Views
8K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 25 ·
Replies
25
Views
3K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 20 ·
Replies
20
Views
3K