English: Bifurcation diagrams of saddle-node bifurcation of two normal forms. When the normal forms are continuous dynamical system, each diagram is drawn by the differential equations

(Left) ${\displaystyle {\frac {dx}{dt}}\mu -x^{2}}$

(Right) ${\displaystyle {\frac {dx}{dt}}=\mu +x^{2}}$.

When the normal forms are discrete dynamical system, each diagram is drawn by the differential equations

(Left) ${\displaystyle x\mapsto x+\mu -x^{2}}$

(Right) ${\displaystyle x\mapsto x+\mu +x^{2}}$.