Is the following argument valid or invalid?
(1) No email messages are written carefully,
(2) but every love letter is very carefully written. ( the instructor's empasize)
(3) Thus, no email messages are love letters.
Surely, without the adverb " very" the argument iis valid.
Does " very" change anything here? What is the standard answer?
Should we treat " very carefully written " as a whole predicate by itself?
Or should we introduce a quantification over " degrees of carefull writing"?
Is there a formalisation that makes the reasoning valid?