Strong (trivial) cofibration in Lurie's HTT

Question

in Lurie's book HTT in annexe A, proof of Proposition A.2.8.2 page 824, he mentions that a map is a "strong (trivial) cofibration" but I didn't succeed to find the definition of this notion that seems to come from nowhere. Do you have some insight ?

Thanks

Answer 1

There is no word "strong" in Proposition A.2.8.2 in Lurie's HTT, at least in the version I have.