Řeš v ℝ nerovnice:
\large x \lt \sqrt 2
\large K = \left( { - \infty ;\sqrt 2 } \right)
\large K = \left( { 0 ;\sqrt 2 } \right)
\large K = \left( { - \infty ; 2 } \right)
\large K = \left( { - \infty ;\sqrt 3 } \right)