Observed arrival · 2026-11-02
The plant engineer’s nine-volume math shelf
A working plant engineer publishes a math textbook for physics, technical certification-study materials, and ad-free browser games.
- For
- Physics learners and Japanese technical-exam candidates
- Worth noticing
- Each volume is offered as a PDF alongside TeX source and verification programs, with downloads subject to the site's terms.
Field notes
The author identifies themself as maintaining electrical and instrumentation equipment at a chemical manufacturer, and describes the site as a personal project alongside that work. Its certification shelf distinguishes available materials—such as second-class electrical chief engineer past papers for 1997–2008 and five air-pollution-control subjects—from several sections marked as in preparation. The homepage also lists 12 solo browser games, including 8 queens, peg solitaire, nonograms, and yacht.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue