### Dark energy definition in equations_ppf

Posted:

**August 08 2019**Hi all,

I have a sort of dumb question! I am soory if that has already been discussed. I cannot get a clear idea.

My question is:

While using spline and cubicsplint for [math] and [math] why [math] is used and not '[math]'. We need to define functions [math] and [math].

If I define [math] and [math] with '[math]' instead of '[math]' in spline and cubicsplint, how will that cause problem?

Do we need to define [math] and [math]? I think not!

Please help. Many many thanks in advance.

Best

Srijita

I have a sort of dumb question! I am soory if that has already been discussed. I cannot get a clear idea.

My question is:

While using spline and cubicsplint for [math] and [math] why [math] is used and not '[math]'. We need to define functions [math] and [math].

If I define [math] and [math] with '[math]' instead of '[math]' in spline and cubicsplint, how will that cause problem?

Do we need to define [math] and [math]? I think not!

Please help. Many many thanks in advance.

Best

Srijita