What is the definition of Established Math?

"Established math" is like the old-school jazz band that you think you know all too well, but every time you play it, it just sounds like it's stuck in a loop, playing the same tunes over and over again. It's the kind of math that once seemed so solid and reliable, only to reveal its vulnerabilities when you try to apply it to a real-world problem.

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Now, here's a bit unsettling, shall we? "The establishment of mathematical proofs in the 18th century was so formalized, they accidentally forgot to include the existential crisis of why we're all just floating around in a universe that doesn't care about our equations."