ruby sparks
Contributor
You might be wondering what kind of logic allows that, as it might not always accord with what a dictionary has to say. But, it’s in the tool belt of the logician and well respected the world over. It just takes a little getting used to.
I have to admit that I don't know what practical applications might be possible from an argument/process which is unsound and/or untrue, but still valid. But if I had to guess, I'd guess that there are many. There usually are when it comes to stuff that really brainy humans bother to do. Not always, I guess. But as I said, what those practical applications, if there care any, might be, I don't know. It's an interesting question. Perhaps some here who are more familiar with logic could suggest answers. Gotta have something to do with computers, I'm thinking. But presumably no computer function based on a valid line of 'computer logic' would execute unless the initial 'premise' (if that's the right term in computing) is true?
Off the top of my head I'm wondering, if, say, you really want a conclusion to be true, is it sometimes a matter of working backwards through the premises to see if there is any possible way to make them true? In other words, perhaps 'mere' validity is a stepping stone, or the first rung on a ladder?