Worked examples, unfolded
The problem is visible; the solution stays closed until you have tried it. Reading a solution is not the same as solving one.
Built for the way people actually learn
Not a PDF with a login. Each topic is written to be worked through, and every method is taught the same way.
$$\frac{dy}{dx} = f(x)\,g(y) \quad\Longrightarrow\quad \int\frac{dy}{g(y)} = \int f(x)\,dx$$
Where it comes from, when it applies, and what it looks like when it goes wrong.
Practice that explains
Every question comes back with the reasoning, not just a tick. Answers are checked on the server, so they are not sitting in the page.
A tutor with context
It knows which topic you are on and what you have been getting wrong. On a problem that counts it gives the next step, not the answer.
Write with a pen
Work on screen with a stylus, zoom in like paper, and hand in a written answer to be read and marked.
A profile that follows you
What you have mastered, what needs review, and when. Spaced repetition brings back the things you are about to forget.
Interactive visualisations
Slope fields, phase portraits, mass and spring systems, the heat equation. Change a parameter and watch the mathematics move.
Exam practice from a verified bank
Hundreds of problems, every answer re-derived by a computer algebra system before it reaches a student.
Courses
Enrolled students sign in and go straight to their course. Ask your instructor for the join code.
Calculus I
Limits and continuity, differentiation and its applications, and indefinite and definite integrals — the first course in the calculus of one variable.
Calculus II
Integration techniques, applications of integrals, sequences, series, and parametric & polar curves.
Differential Equations
Core differential equations course with series solutions.
Mathematics for Engineering
Differential equations with PDEs for engineering students.
Foundations of Mathematics
Logic, methods of proof, sets, relations, functions and cardinality — the course where mathematics stops being calculation and becomes argument.
Linear Algebra
Systems of equations, vector spaces, linear transformations, eigenvalues, orthogonality and least squares, and the singular value decomposition.
Mathematics for Electrical Engineering
Differential equations with complex numbers for electrical engineering students.
Why it exists
Students do not disengage because mathematics is hard. They disengage because they get stuck, alone, at eleven at night, and nothing in the course is awake. Everything here is aimed at that hour.
It is built, funded and taught by one person, and used with real classes before any part of it is made general. More about how the teaching works.