There's (unknown) objective truth.(Otherwise logic fails, because A and not A are equally true.)
This means that probably some of our knowledge is true (or some of our future knowledge might be, and we can't know which). This means there is progress in knowledge and purpose to argument.
The thing about correct spellings of words is just failure to define a problem tightly. Like you say, there is a correct spelling of a word in order to belong to a particular set. There isn't a correct spelling of a word, or a correct albatross, or a correct anything that can't undergo a specified (or implied) test for correctness.
(,
Mon 5 May 2008, 3:27,
archived)
This means that probably some of our knowledge is true (or some of our future knowledge might be, and we can't know which). This means there is progress in knowledge and purpose to argument.
The thing about correct spellings of words is just failure to define a problem tightly. Like you say, there is a correct spelling of a word in order to belong to a particular set. There isn't a correct spelling of a word, or a correct albatross, or a correct anything that can't undergo a specified (or implied) test for correctness.