If it's obvious, then you didn't need to say it.
this post was submitted on 15 Jan 2025
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I had an electrodynamics textbook (Griffiths) that was the worst since it did this all the time.
It made studying it really hard because it skipped so many intermediate steps that I couldn't follow it and ended up even more confused.
It was one of the few courses I ended up with a C in, despite trying really hard at it.
It's one of the reasons I ended up in engineering rather than physics or mathematics. The numbers are more intuitive and everything isn't an obscure proof.
Albert Einstein is said to have stated: "If you can't explain it simply, you don't understand it well enough." i say : pedagogy is as important as mathematics.
Obviously.
Quantum mechanics has entered the chat.
the fun thing about this is that the textbooks get more judgy the more advanced the material gets. heres an example from a graduate level algebra textbook by lang.
That's when you ask for their proof.
The proof is left to the reader
They told me the proof was in the pudding after I had already eaten the pudding 😩
diffemples
I.E. "I don't feel like writing out the proof." See also: "this is left as an exercise for the reader."
I just absolutely love the transition from the bottom left bit to the next one. Diffemples.
Maths*