maths

[s]

the function f(x)=max{x,1} is

a. not quasi convex
b. quasi convex but not convex
c. convex
d. concave

ans is convex..why is it not quasi convex?

[Amit Goyal]

it is also quasi convex

[ritu]

f:Rn---R is a  twice differentiable function is concave and homogeneous of degree 1.f is
a.positive definite
b.negative definite
c.singular
d.non-singular

[s]

ohh ok got it sir..its convex and also quasi convex so the option quasi convex but not convex is wrong..i missed out on that one :

[sweta]

@ritu
 i think the ans is negative definite.

its positive definate for a strictly convex function.