In fall of 2019, the Thursday seminar at Harvard University studied motivic infinite
loop space theory. As part of this, the authors gave a series of talks outlining the
main theorems of the theory, together with their proofs, in the case of infinite perfect
fields. In winter of 2021/2, Bachmann taught a topics course at LMU Munich on strict
-invariance
of framed presheaves (which is one of the main theorems, but was not covered in
detail during the Thursday seminar). These are our extended notes on these
topics.