analisis matemàtic

x [< y+x <==> 0 [< y

x >] y+x <==> 0 >] y

x < y+x <==> 0 < y

x > y+x <==> 0 > y

(n+1)x [< y+x <==> nx [< y

(n+1)x >] y+x <==> nx >] y

(n+1)x < y+x <==> nx < y

(n+1)x > y+x <==> nx > y

x+y [< f(x)+y <==> x [< f(x)

x+y >] f(x)+y <==> x >] f(x)

x+y < f(x)+y <==> x < f(x)

x+y > f(x)+y <==> x > f(x)