I’m a little late on this, but I was more or less snowed in yesterday. It was lovely and I slept very well after all my shoveling, snow blowing and moving-college-man-back-to-his-dorming.
Kierkegaard composed the phrase, "truth is subjectivity".
With the comma, seems correct or is at least clearer.
"truth is subjectivity" is not a sentence in itself and is not worthy of its own period.
That's the Owlbow rule anyhow and it makes the meaning of your sentence more clear and (no comma needed after an and) that's what's important isn't it? (Did that sound too arrogant?) Ah, you know what I mean.