There is a rock, but no one is there to perceive it, because we all died an hour previously. — S
We could call this a premise, okay.
Is there a rock? Yes or no?
Followed by two questions . . . Which is fine, but of course questions are not logical entailments.
Yes, a rock is an object,
That doesn't follow from anything above, it's just another claim.
and the existence of objects don't depend on us being around perceiving them.
Again, this doesn't follow from anything above it. It's just another claim.
It is not the case that to be is to be perceived.
Doesn't follow from anything above. Another claim.
To be is to be
Doesn't follow. And it doesn't actually exclude "to be is to be perceived."
and that's that.
The stylistic gesture we mentioned earlier.
Some people, however, believe that there isn't a rock
Doesn't follow from anything above (it's probably not supposed to, but I'm just making sure we know that).
because that would be a contradiction.
Doesn't follow from anything above. Also, they don't believe that there isn't any real rock
because of any contradiction, by the way. It's rather just that their belief contradicts your belief.
But there isn't a contradiction unless you go by an idealist premise,
This doesn't follow from anything above, and as a claim, it also doesn't make much sense. Again, the only contradiction is that their belief is the negation of yours.
an idealist premise which is demonstrably false
There were no demonstrations above, no argument--nothing followed from anything else. It was just a series of claims.
as it leads to absurdity, as per the above scenario.
But you showed no absurdity at all.