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Differential Equations

Equations whose unknown is a function: growth, oscillation, and how physics is written.

Дарсҳо

Core Separable equations dy/dx = f(x)g(y): separate, integrate both sides, solve for y. y' = 2y Core First-order linear equations y′ + P(x)y = Q(x) and the integrating factor that makes it integrable. y' + y = x Core Second-order, constant coefficients ay″ + by′ + cy = 0 and the characteristic equation: oscillation, damping, growth. y'' + y = 0 Advanced Nonhomogeneous equations Driving forces: homogeneous solution plus a particular solution. y'' - 3y' + 2y = e^x Core Modelling with differential equations Growth, decay, cooling, mixing: writing the equation from the sentence. y' = 0.05*y

A differential equation relates a quantity to its own rate of change, which is how every law of physics is stated. The solver names the method (separable, integrating factor, characteristic equation), solves, verifies by substitution, and draws the family of solutions.

Дарси иловагӣ

Introduction to Differential Equations

Basics of Differential EquationsDirection Fields and Numerical MethodsThe Logistic EquationFirst-Order Linear Equations

Differential Equations

An introduction to differential equationsQualitative behavior of solutions to differential equationsEuler's methodSeparable differential equationsModeling with differential equationsPopulation growth and the logistic equation

Second-Order Differential Equations

Second-Order Linear EquationsNonhomogeneous Linear EquationsApplicationsSeries Solutions of Differential Equations

First order

Differential equationOrdinary differential equationSeparation of variablesIntegrating factorLinear differential equationExact differential equationBernoulli differential equationInitial value problemSlope fieldPicard–Lindelöf theorem

Higher order and systems

Characteristic equation (calculus)Method of undetermined coefficientsVariation of parametersWronskianSystem of differential equationsPhase portraitStability theoryHarmonic oscillator

Transforms and PDEs

Laplace transformFourier transformPartial differential equationHeat equationWave equationLaplace's equationSturm–Liouville theoryGreen's functionNavier–Stokes equationsNumerical methods for ordinary differential equations

Баъзе аз ин дарсҳо аз матнҳои кушода гирифта шудаанд: Boelkins, Active Calculus, OpenStax Calculus Volume 2, OpenStax Calculus Volume 3, Wikipedia. Ҳар саҳифаи дарс номи манбаи онро ва иҷозатномаро дорад.

Символы, используемые здесь

Барои муайянкунии пурраи маъно, тасвир ва маънои ҳар як ҳарф дар он, ба ҳар як аломат пахш кунед.

Саволҳои маъмул

What is a differential equation?

An equation whose unknown is a function, relating it to its own derivatives. "The rate of growth is proportional to the population" is y′ = ky, and solving it means finding y as a function of time.

Why does the solution have arbitrary constants?

Integrating loses information: many functions share the same derivative. An n-th order equation has n constants, fixed by n initial or boundary conditions.

Шумо мушкилоти худро доред?
Дар саҳифаи ҳалкунанда онро навишта ё кашед: ҳар қадам, тасвир, ҷавоб то он даме, ки шумо пурсед, пинҳон аст. & Ҷудо кардан →

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