Oct 8, 2013
categories don't make sense w/o intuitions
intuitions gives content to the concept
a priori status of intuitions
- space and time (they are formal intuitions); also have
empirical reality (can experience them in reality outside); can
cognize space and time; reality of space and time bound up in
-formal intuition: space that I manipulate when I do geometry
(geometry is synthetic a priori)
a priori status of space (A23-24, B38-39)
representation of space has to be presupposed if I’m going to
refer to human awareness. can't be aware of anything outside
myself unless 'outside' exists. when I describe my external
experience, I presuppose that space exists
if you assume there are objects, there must be space. because
objects exist in space. space isn't what exists btw objects.
space is where objects exist.
that's why space and time are a priori. because they are
presupposed when we talk about external reality.
so space and time are epistemic conditions when we discuss the
possibility of us having human experiences with external reality.
we can represent to ourselves space as being empty of objects but
can never envision space as not existing. we can imagine no
space. but can't say there is no space if we want to have
knowledge of reality.
epistemic claims not psychological claims: impossible to remove
space and time and still have anything to intuit.
not like we are just imagining objects in our head, the objects
actually exist out there. objects are both a form in our heads
and also exist out there. we have a formal intuition of space
(otherwise would not be able to create math that applies to
when we experience a body, we necessarily regard the spatial
properties of that body as primary because it is only because of
those primary properties that we consider that body as existing.
Innate ideas – extension and figure; motion
for Kant, innate ideas get their justification from experience.
For Kant, to be a body is to have spatial properties and we have
to be able to experience it (in extension and figure). so
extension and figure are innate ideas that are a priori. Motion is dependent on extension and figure existing. because
can't imagine motion existing alone. need motion to pertain to an
object. motion is dependent on time because objects move through
time. extension, figure and motion are intuitions (they exist in
our mind a priori and then we apply them to objects in real
extension, figure and motion exist in space and time.