1. Basically, your premises might not be entirely accurate, unknown to you at the time.
2. Isn't what he's actually saying. He means the opposite, ie If x is logically impossible it might still be possible due to 1.
3. Again this is because of 1. The whole water/H2O argument is absurd and just a case of a lack of proper definition, as shown by "if you think". Water is H2O, H2O is water, it's common name. Your average glass of water might not be pure H2O, but then it becomes a different argument. Fiddling the definitions doesn't change the reality of the matter.
4. This is where we start to notice there's only really one message in this paragraph, that stated in 1.
Quote:
|
Originally Posted by asaris
"Logically impossible" just means that a contradiction can be derived from it. It's not a philosophically controversial definition.
|
Yes. Your logic depends on the integrity of your premises however, and if they're wrong and you don't know it then your argument is still invalid.