I know the maths behind, I know if I do the algebra I can get the result of the 3 cases. I also have an intuition of the 3 cases: Quora
However, I just cannot memorize this "simple" 3 cases whenever I need to apply them in real life problems.
I don't know if it is a shame that a CS graduate has to Google this theorem, which I learnt at the first year in University, just because I cannot memorize it. (Or is it actually no need to memorize it, please tell me, I will close the question at once)
So assuming this basic theorem is important and I have to memorize it just like how we memorize
F = ma in physics field, is there any way to aid memorizing these 3 cases in long term speaking?
A way may means visualization, better intuition with clear reasoning behind, or even just die hard memorizing it, I just want to know how other CS people memorize this theorem.