Four Fours/Lemmata/Two Fours/9
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Puzzle
Using exactly $2$ instances of the number $4$, the task is to write an expression for $9$, using whatever arithmetical operations you consider necessary.
Solutions
Solution $1$
- $9 = \dfrac 4 {. \dot 4}$
Solution $2$
- $9 = \dfrac {\map \Gamma 4} {\sqrt {. \dot 4} }$