Sheafification and what the hell it is: Construction and universal property

Sheafification and what the hell it is: Construction and universal property

0:00 start
4:00 define Sheafification
13:35 prove sheafification is a sheaf
17:00 prove stalks of presheaf are the same as stalks of sheafification
26:00 prove sheafification has the universal property

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We show that The stalks of the affine scheme are the ring localized at the prime ideal p

Algebraic geometry (Scheme theory):

https://www.youtube.com/playlist?list=PLg9w7tItBlZsfWmzEMbcZo7dIDJez1Iyv