Five courses, and the tools I built for them
Teaching assistant at the Faculty of Computer Science, University of Indonesia. Material below is written for students, in the language of the class it was taught in.
AI & Data Science
2026
SE Project
2025
Operating Systems
2025
Calculus 1
2023-2026
Calculus 2
2024
featured tool · live
Kalkulus 1 Practice Portal
An interactive problem viewer and question bank for CSGE601012, Short Semester 2026. Hundreds of problems across six sets, with instant solution reveals, LaTeX math and TikZ geometric diagrams.
Notes & walkthroughs
12 entries2026-08-18Ensemble Learning & Explainable AI (XAI): From Model Accuracy to Real-World AccountabilityFull lecture notes: bagging, boosting, stacking, then SHAP and LIME on the same model.AI & DS2026-08-15Univariate Calculus via Nonstandard Analysis: The Infinitesimal ApproachLimits and infinitesimals, worked from first principles.Calculus 12026-06-19CSGE601012: Kalkulus 1 SP 2026, Interactive Problem Portal & ArchiveAnnouncing the interactive problem portal and PDF archive for Short Semester 2026.Calculus 12024-02-08Anum Week 0Floating-point precision and machine epsilon -- why finite bits cannot hold infinite digits.Numerical Analysis2024-02-08Anum Week 1Forward and backward substitution for triangular linear systems, with MATLAB code.Numerical Analysis2024-01-01Volume dan Luas Permukaan BolaSphere volume and surface area formulas for UTBK/entrance-exam prep.Calculus 12024-01-01Luas dan Keliling LingkaranCircle area and circumference formulas for UTBK/entrance-exam prep.Calculus 12023-12-20Injektif SurjektifInjective and surjective linear maps, worked through examples.Calculus 22023-12-19Proof of Inverse Existence for A^TAA worked proof that A-transpose-A is invertible when A has full column rank.Calculus 22023-11-09Intro to IntegralIntegration and differentiation rules -- constant, product, quotient, chain, exponential and logarithm -- with worked examples.Calculus 12023-11-08OS: Cheatsheet for Making Tarball and Copy TO OS1Making and encrypting tarballs, then moving them over SSH/SCP -- a practical sysadmin cheatsheet.Operating Systems2023-10-25Ruang Vektor Umum: Bagian 3General vector spaces, part 3 -- continuing the Ruang Vektor Umum series.Calculus 2