I need to see way more than Pythagoras' theorem to be convinced. Show me a couple of pages of "complex" concepts, with something like ten equations involving su

I need to see way more than Pythagoras' theorem to be convinced. Show me a couple of pages of "complex" concepts, with something like ten equations involving summations, triple indices and whatnot. Something like this [1] (no affiliation, first random thing I found). I bet emojis will make it even worse. [1] https://www.jefkine.com/general/2016/09/05/backpropagation-in-convolutional-neural-networks/ https://www.jefkine.com/general/2016/09/05/backpropagation-i...