501 karma · joined January 8, 2015
Another one is mathematics in lean
https://leanprover-community.github.io/mathematics_in_lean/
It's a text book with many examples for you to try. There are sample solutions which if you get stuck (which I often do) you can take a peek for some help. I actually just grep the solution file -A1 , -A2 etc to peek at the solutions one line at a time
Example problems and solutions
For me are three distinct things
Japanese curry Japanese style of the Indian dish often made from an instant roux package and usually served over Japanese style white rice
Katsu Curry the same dish with a deep fried pork or chicken cutlet put on the the rice before the curry is poured over
Curry rice - no cutlet, the curry is mixed in with the rice before it's served.
https://www.uclahealth.org/patient-resources/support-informa...
https://compliance.usb.org/index.asp?UpdateFile=Electrical#:....
"The second major advantage of Si is the existence of a native oxide (silicon dioxide, SiO2), which is used as an insulator"
If you liked that you might like the natural set game as well.
https://adam.math.hhu.de/#/g/djvelleman/stg4
The author of the math book "How to Prove it" Daniel Velleman who I think did the set game also has a "How to Prove it with Lean" which is nice because the exercises correlate to the book.
https://djvelleman.github.io/HTPIwL/
I've found the lean community on zulip really open to amateurs to want to learn. I asked what I considered a "duh" type of question once I saw the answer, and the guy that helped me is kind of "the lean math" guy.
In terms of improving the environment it would seem like not driving/using public transportation trumps any ev or hybrid anyway.
https://www.encinitasca.gov/government/departments/developme...