TITLE: Online introduction to Lattice Theory?
QUESTION [12 upvotes]: Apart from J. B Nation's (revised) Notes on Lattice Theory, is there any other (mostly introductory) material on Lattices available online?

REPLY [2 votes]: Old thread, but who knows this might be useful to someone. A video lecture on Lattices:
https://www.youtube.com/watch?v=qPtGlrb_sXg