Four Fours/Lemmata/Two Fours/16

Puzzle

Using exactly $2$ instances of the number $4$, the task is to write an expression for $16$, using whatever arithmetical operations you consider necessary.

Solutions

Solution $1$

$16 = 4 \times 4$

Solution $2$

$16 = 4^{\sqrt 4}$

Solution $3$

$16 = \sqrt 4^4$

Solution $4$

$16 = \sqrt {4^4}$

Also see

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