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### 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 and why is used and not ''. We need to define functions and .

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

Do we need to define and ? I think not!