funkcia:  \;  f( x  ) 

f(x) = If[0 ≤ x < 3, 4, 3 ≤ x < 5, x + 1, 6 ≤ x < 8, (-x) + 11, x ≥ 8, 5]
B = Point(f)
C = Point(f)
E = Point(xAxis)
g = OrthogonalLine(E, xAxis)
F = Intersect(f, g)
h = Segment(E, F)
a: f(E)
b: x(E)
text2: "Pre \; x= " + (LaTeX[b]) + "  \; existuje \; číslo \; \textcolor{ red} \boldsymbol{ f(" + (LaTeX[b]) + " )=" + (LaTeX[a]) + "  }  \; funkčná \;  hodnota"
text4: "Pre \; x= " + (LaTeX[b]) + "   \; neexistuje \; číslo \; \textcolor{ red} \boldsymbol{ f( " + (LaTeX[b]) + " )= ?  }  "
text3 = If(a ≠ f(b), text4, text2)