If it's referring to Plato, we call it the theory of Forms.
It's definitely the modern version of the Ancient Greek word Plato uses for the Forms, but it apparently would translate our word "idea" as well. I agree with you, though. If I saw this out of context, I would definitely say the Theory of Forms.
So, if you have an ancient name, like Πλατων, do you decline it like an Ancient Greek noun or like Modern Greek?
Here You can use either, ancient greek-like declination is more sophisticated, but used.
He also came to my mind straight ahead! Great to meat ppl with some education.
Is this a Greek expression if so what does it mean
the ideas theory.Please tell me why this is wrong.Thanks.