Not sure if this is the right place, but as it is philosophy...
While puzzling over the meaning of 96c3-97b7 of Phaedo (in the section where Socrates recalls how he got into philosophy and became disillusioned with current ideas) I decided the gist of the argument here is that satisfactory causes cannot be found in the physical world, backed up by Plato's comments on mathematics- that you get 'two' both by adding and dividing, for instance- and the hint that the answers are to be found in non physical forms, as suggested by mathematical laws which are always self consistent, leading him to formulate his hypothesis. (If mathematical laws are self consistent, they must surely refer to forms, or else how to explain that one can get 'two' both by adding and dividing??)
However, I feel this is all rather sketchy and would appreciate any enlightening comments from other Plato enthusiasts.
Do you believe absolute forms exist separate from the mind or are they existent only in as much as a person believes in them? Me, I would probably go for the latter.
Yours in aporia,