Math is one of the main categories--although there are other especially adjacent ones--where I often think that 1.) You either already know this stuff or you're going to emerge no more enlightened and probably click elsewhere after the first few sentences, and 2.) Some people really love to play with their equation editors.

Wikipedia's math articles can be dense and assume you're an expert, but I've never known them to be wrong.

There's other types of bad than wrongness.