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Comment by teo_zero | Hacker News Reader

Never understood why 7 is considered difficult...

7 = ⌈ 2.2² + 2 ⌉

Rounding spoils the fun of the puzzle.

It seems very much in the spirit of allowing concatenation and square roots...

Rounding is a completely valid mathematical operation.

(2 << 2) - ( 2 / 2)

It is difficult when the rules do not allow exponentiation.

  7 = ⌈ 2.2 + 2 + 2⌉

Would still work.