Suekdccia Messages 352 Reaction score 30 Thread starter Nov 2, 2017 #1 What do we mean when we say that a system can't change (in time) because its evolution is unitary? Last edited by a moderator: Nov 3, 2017
PeterDonis Mentor Insights Author Messages 50,390 Reaction score 26,444 Nov 2, 2017 #2 Where have you seen this claim made?