notation error P1.T1.R2 regarding the variance of portfolio?

[Pflik]

I'm reading p1.t1.r2 which was published a couple of days ago.

on the 5th line (the definition of variance of p) i see that the covariance ab is being added instead of multiplied. Is this an alternative calculation or a typo?

 

[David Harper CFA FRM]

Hi PFlik - yes, absolutely my error, apologies, thanks for noticing! I fixed and re-uploaded the PDF. thanks,