積分の書き方

  •  F(x) = {\displaystyle\int f(x)dx}
  •  F = Integ(f)

正確には:

Integ(f) = \{g\in Functions \mid D(g) = f\}  \\
= \{g_0 + C \in Functions \mid D(g_0) = f \land C\in {\bf R}\}