
Quoting
plushevyitigr
It clearly may be difficult to prove that someone has lied just based on them stating something false; naturally, people can be confused. Here however we have a case when the same person provides two mutually incompatible descriptions of the same event; you may not know which one of the two descriptions is false (I know that they both are but you don't need to believe me). You do need to acknowledge, however, that given that the two descriptions are mutually incompatible, one of them has to be false, and deliberately so. And given that both were presented under oath, you have perjury in at least one instance. And yes, the event was material - it was an instance of abuse he claimed.