1.
g_n(x)=(1-x^n)^(1/n)とおくと、
単調収束定理より
lim[n→∞]∫[0,1]g_n(x)dx
=∫[0,1]lim[n→∞]g_n(c)dx
=∫[0,1]step(x)step(1-x)dx
=∫[0,1]dx
=1