Where does it get stuck?
First we look for the source of the problem: calculation, overview, definitions, notation, proof structure or exam technique.
Mathematics, physics and science-heavy courses
Jos van der Spek
Some people learn a trick. I try to help you understand why it works.
For pupils and students: from Dutch Wiskunde B/D, physics and exam preparation to service mathematics in science-heavy degrees and the first abstract university mathematics courses. Calm, precise and without false understanding.
abstract notation
Make it clear
Can you think in four dimensions? The small panels first show how a sphere passes through a lower-dimensional space; the cross-section grows according to the same radius law.
Approach
From getting stuck to getting a grip.
From exercise to idea
A formula, physics question, linear map or limit should not only be formally correct; it should become imaginable.
Solving new problems yourself
The goal is not just to copy an example, but to see which definition, formula or strategy fits a new exercise.
Subjects and levels
Mathematics and science subjects without the fog.
The question can be very practical: a test, exam, chapter or set of exercises. My strong side is explaining the mathematical layer seriously, also when it is hidden inside another science-heavy subject.
Secondary school
Dutch Wiskunde B/D, physics, exam preparation and rebuilding basic skills and overview.
Service mathematics
Calculus, linear algebra, probability theory, differential equations, networks and modelling for non-mathematics students.
University
For students in physics, biomedical sciences, Life Science & Technology, Molecular Science & Technology, chemical engineering, computer science and related programmes.
Deeper topics by agreement
Linear algebra, analysis, logic, set theory, group theory, ring theory, topology and some differential geometry, honestly within my current reach.
"From exam exercise to Algebra I: first the words and symbols have to become clear."
That is why the explanation can stay practical while still taking the underlying ideas seriously.
Profile
Substantive, enthusiastic and personal.
My background is in mathematics, astronomy and theoretical physics, with BSc degrees in Mathematics and Astronomy at Leiden University, plus experience as a teaching assistant, in presentation and communication, and in individual tutoring. I like helping people cross a mathematical threshold: an exam chapter, an abstract course or a technical argument that suddenly feels like too much at once.
BSc Mathematics, Leiden University
BSc Astronomy, Leiden University
Wiskunde B/D, exam preparation and philosophy
Logic, set theory and abstract reasoning
Besides that
Also help with technical thresholds.
Mathematics is the main thing. But the same calm explanation can also help with practical digital questions, especially when you want to understand what a tool is actually doing.
AI onboarding
Getting started with ChatGPT or similar AI tools: prompting, privacy, realistic expectations and calm practice.
Mac and media
macOS workflows, files, installing software, video formats, codecs, subtitles and export settings in practical language.
Language and argumentation
English, Dutch or philosophy by agreement, especially where reading, precise formulation and reasoning are central.
Contact
Send a short note about where you are stuck or what you want to know more about.
Mention your programme, subject or topic, and where it feels rough: calculation, definition, proof, notation, exam technique, settings, files or overview. Then we can see together how and where tutoring may be useful.