β=α1+α\beta=\dfrac{\alpha}{1+\alpha}β=1+αα
α=β1+β\alpha=\dfrac{\beta }{1+\beta}α=1+ββ
β=αα−1\beta=\dfrac{\alpha}{\alpha-1}β=α−1α
α=β1−β\alpha=\dfrac{\beta}{1-\beta}α=1−ββ
