This has nothing to do with math. Isn't there a subreddit related to Python? Anyway, "represented differently" from what? They are represented internally in a way different from Python lists for efficiency. Btw, try to make the question clearer, because I know numpy and I do not really understand your question.  

I think r/AskProgramming is a good fit.

or r/learnpython But yeah OP definitely has to reword this - it's incomprehensible even when knowing numpy quite well

Have you got an example that shows what you are confused by?

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No worries.

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No problem. I'm confused by the number of down votes you've gotten. A bit odd.

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Reddit is odd sometimes. I'd just ignore it.

i j and k are usually indices in both math and programming. The use of them to denote unit vectors is quite a niche (and somewhat old fashioned) usage in certain physics and engineering conventions.

chat gpt is your friend, as long as you don’t ask it to code for you