*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/undo.html).*

# Superscript Equals Sign (`⁼`)
    
## `𝔽⁼ 𝕩`, `𝕨 𝔽⁼ 𝕩`: Undo
    
Invert the function `𝔽`, or use its defined inverse. Not all functions have inverses.
    
    
           1 - 2

           1 -⁼ 2

           √ 16

           √⁼ 4

           ⋆ 1

           ⋆⁼ 2.718281828459045