[nileshtrivedi]

> How would you convince a Solipsist that there is an objective truth?

I can't. But let me quote Bertrand Russell from "An Outline of Philosophy":

Solipsism (the theory that I alone exist) is a view which is hard to refute but still harder to believe. Solipsism is not really believed even by those who think they are convinced of its truth.

A solipsist would have no objection to jumping from a cliff, would he? But he won't actually do it.

[quinnchr]

Why would a solipsist have no objection to jumping off a cliff?

Just because you believe reality doesn't exist outside your own mind doesn't mean you can't die.

[nileshtrivedi]

That's not the point. If you really are a solipsist, why would jumping off a cliff have more probability of leading to death than not jumping (because the cliff doesn't really exist)?

[quinnchr]

Ummm... what?

All solipsism says is that you can't be sure reality exists outside of your own mind. You can question whether or not you would be dead outside of your own experience, but you'd still be dead in your internal world.

[philwelch]

The only reason to believe that jumping off a cliff leads to death is because that's what we observe happening to other people and we assume we are like other people. But the solipsist has no reason to believe this as the other people don't exist outside of his own mind therefore he is not like them.

[quinnchr]

"But the solipsist has no reason to believe this as the other people don't exist outside of his own mind therefore he is not like them."

Except the solipsist is also unsure he exists outside of his own mind too, so why would he believe he is the sole exception to everything he's observed in the only reality he can be sure of?

[philwelch]

He already believes he's the sole exception to everything he's observed by definition of being a solipsist.