@Bobby Cole 1+1 can = 3 if you assume another factor is involved. 1(x) + 1=3 and we discover that factor to be 2. That is the absolute of algebra. If the teacher asked young Johnny to approach the board and solve 1+1= and Johnny answers 3 and the teacher says wrong and gives young J an F that would be justified since J made an assumption that wasn't indicated, however, if she says, "Interesting Johnny how did you arrive at your answer?" and young J writes out 1(2) + 1=3. then young J has just made what appeared his opinion a fact and an educational experience.
Which, if accepted by the instructor would make the premise subjective. But of course, subjectivity is the new norm whereas objectivity is looked upon as bias. e.g. Is he or she a male or a female? Dunno, it depends on what he or she thinks he or she is today. Any other answer is considered bias and highly opinionated with an attachment to one or more phobias.