Alright. You’ve actually somewhat impressed me by being straightforward and reasonable.
[Yes - although your examples here are unfortunately far too limited (they are all about persons). Other kinds of entities, like chess, or shadows, or science, or morality, or propositions, or numbers, or relations, or transcendentals, or spirits, or faculties, or essences, may still be problematic…]
Let’s stop here. See, this is why I wanted you to bring up clear examples in the beginning. If you had said something like “numbers” in the beginning, you might have saved us some time.
What I’m claiming is that the process we go through to determine whether a person is real or not is the same process we use to determine if other things are real, like chess. It applies to numbers, spirits, shadows, everything else on your list.
I have no problem, for example, accepting that spirits are real in the same way that Spiderman is real – as things that people have thought up and that persist as stories in the popular imagination.
But just as there is not actually a person walking the earth who was bitten by a radioactive spider and gained superpowers, so too are there no spirits.
Similarly, I accept that numbers exist in the same sense as Spiderman and spirits – they’re really thoughts that persist in human cultures, but they’re not real in the sense that they’re floating in the ether independently of people. If all human minds vanished tomorrow, the idea of spirits would also vanish, as would the idea of the number four.
I presume that there will be an objection to that last sentence, so let’s hear it.
[To be very clear, I’m not saying that numbers are fictitious characters or that they were invented in the same way as fictitious characters. Numbers are models of reality, abstractions from our experience of reality. As such, they exist as thoughts in the mind, as models of reality.
Similarly, I have in my head a model – a mental picture – of my living room. It’s a real model of the room, and I generated it from my experience of the room. I can use that model productively to actually help me do things, but it’s still just a model. If my mind were to vanish tomorrow, the model would vanish as well. And if a similar model of the living room exists in the minds of other people, then if their minds were to vanish, then all models of the living room would vanish as well]
But other than that, your distinction remains problematic insofar as it’s not clear how it is supposed to apply or be relevant to the problem of establishing and explaining an epistemic criterion.]
Well, ok, good. I was just getting to that.
Here’s the question you asked on this subject:
What do you mean by an ‘act of induction’ and an ‘act of deduction’ and by what general criteria do we determine whether such an act is “performed on the basis of evidence” or not - presumably in such a way that it produces knowledge?
There are several different questions in there, and I’m going to tackle them one at a time, making sure that we reach agreements before moving on to other parts of your question.
I’ll start with the last part first – what general criteria do we use to determine whether or not an act is “performed on the basis of evidence”?
Well – hang on to you hat – in general, we determine that an act of reason is performed on the basis of evidence when it cites data obtained from the world as part of its premises.
For example, here are two acts of reason that are evidence-based:
- I believe that my car will start when I turn the key because it has started every time I have turned the key in the past when the car was working properly.
- I believe that the sun will rise tomorrow because the sky is blue.
Both of these conclusions have data obtained from the world as a premise of the argument, and both are evidence-based arguments. The difference, obviously – and yes, I am using an obvious example here, intentionally so – is that the second evidence-based conclusion is ineptly reasoned out from the evidence.
Are we in agreement so far on the general criteria for determining whether an act of reason is evidence-based?