Richard Costa — notes https://richard-costa.github.io/notes/ Notes and working material by Richard Costa. en Sat, 26 Sep 2026 18:06:37 -0300 Review of Quantum Mechanics https://richard-costa.github.io/notes/quantum-mechanics/review.html https://richard-costa.github.io/notes/quantum-mechanics/review.html Sat, 26 Sep 2026 18:06:37 -0300 Note · draft draft Dirac Notation and Riesz Theorem https://richard-costa.github.io/notes/quantum-mechanics/dirac-riesz.html https://richard-costa.github.io/notes/quantum-mechanics/dirac-riesz.html Sat, 26 Sep 2026 18:06:26 -0300 Note · draft draft Introduction to Logic https://richard-costa.github.io/notes/logic/introduction.html https://richard-costa.github.io/notes/logic/introduction.html Sat, 26 Sep 2026 18:06:15 -0300 Note · draft draft YAD calendar popup for Waybar https://richard-costa.github.io/notes/linux/waybar-yad-calendar.html https://richard-costa.github.io/notes/linux/waybar-yad-calendar.html Sat, 26 Sep 2026 18:06:10 -0300 Note · mature mature Using the SDDM Astronaut theme https://richard-costa.github.io/notes/linux/sddm-astronaut-theme.html https://richard-costa.github.io/notes/linux/sddm-astronaut-theme.html Sat, 26 Sep 2026 18:06:02 -0300 Note · developing developing Installing and updating Quarto on Arch Linux https://richard-costa.github.io/notes/linux/quarto-on-arch.html https://richard-costa.github.io/notes/linux/quarto-on-arch.html Sat, 26 Sep 2026 18:05:52 -0300 Note · mature mature