When math textbooks casually drop a derivative of the delta function like it's no big deal! The left side shows someone smiling confidently ("The") while the right side shows the same person having an existential crisis ("What?") after seeing that cursed equation.
For the uninitiated, the delta function is already a mathematical oddity (it's infinitely tall at one point and zero everywhere else), but taking its derivative is like dividing by zero while riding a unicycle on a tightrope. Even seasoned math majors get that "brain.exe has stopped working" feeling when they encounter this monstrosity in their textbooks!
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