Steve H,
Oh ffs! You obsessive rationalists really piss me off!
Really? If (heaven forfend) you suffered a cardiac arrest in the street one day would you rather an “obsessive rationalist” who’d studied medicine for several years pushed his way to the front of the crowd to help you, or an irrationalist armed with his phial of homeopathic “remedy”, or with a bunch of sage leaves and a box of matches?
See that’s the things when people dismiss rationalism. It’s fine when it’s a free bet if you like that thing, but it really isn’t
when it actually matters. Fancy a holiday in Ibiza? Fine. Would you rather fly on a ‘plane designed and built by qualified aeronautical engineers, or constructed by the new school of faith aeronautics where the designers hop backwards in small circles with pencils up their noses off their tits on Benylyn to produce their blueprints?
Have you ever been in love? Do you enjoy certain activities? Do you love some foods and hate others? Prove it!
That’s called a category error. Being “in love” is just a label we attach to an emotional response to a stimulus, generally one that triggers various hormonal activities. What we’re in love
with on the other hand – whether it’s a objectively tangible object in the world or a fantasy – is an entirely different matter.
Evidence, Evidence, Evidence!
Simple enough – just take a blood sample and measure the hormones (adrenaline, dopamine, serotonin etc) when the subject thinks of the object of his love:
http://www.youramazingbrain.org/lovesex/sciencelove.htm [Edited, because the original was even ruder, but I don't want to get banned.]
No need to be rude – just try not to be logically hopeless.
You got the answer right because maths is an internally consistent system. That doesn't prove that your reasoning powers successfully refer to the real world.
Nothing does. What would “the real world” even
mean, and how would we know whether we’d identified it? What we actually have is a world we appear to observe, and various ways provisionally to model and make sense of it. Some of those methods produce
solutions – ie, answers that appear to be coherent, cogent and consistent such that they enable us to navigate the world we appear to occupy, for example by creating medicines and rockets. Others though (“God” etc) are no more than guessing because they offer no method of testing and investigation.
The former group we call probabilistically “true”, the latter probabilistically not true. If you think of reality as an onion, the guessing is the outer layer – any guess is as epistemically (in)valid as any other: “God”, leprechauns, whatever. Doesn’t matter. The next layer in though is the probable truths layer because it provide functional solutions (aspirin, algebra etc). Now whether there even is a centre of the onion of absolute reality, and how we’d ever know whether we’d found it in any case even if there is is unknowable (the problem of unknown unknowns), but that’s all we have to go on nonetheless.