Summary: Hit vector v with matrix A we get the new vector v'. Now if angle between v and v' is <= 90' which means it doesn't changes direction it means its positive semi definite and if its < 90'(see its strictly less no equal sign) then its positive definite matrix. great video

Thank you so much sir.

aye thanks

:face-red-heart-shape:

Thank you a lot. This is much intuitive and better than long technical calculations.

good work

gang gang good stuff doc

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If this concept is exactly like he has explained, then it's really amazing video 💯

He was God! Such a clear explanation

Legendary. Thank you for blessing the world with this video.

Dot product between matrix A and the vector?! Not sure if I follow... so you mean A.x is a dor product with a result that is a scalar, let's call it S, and If S>0 then A is positive definite?! I thought we had to do xAx to get that scalar S!

Amazing Video!!

Months of struggle in understanding and forgetting every time came to end. I guess I would never forget this concept. Thanks much.

Thankyou soooo much brother. This really helped me out!!!

man explained just one topic so well he had to disappear..

elite explanation

Can we get more such videos?

Great illustrations thank you so much

thanks!