A priori can be synthetic and analytic
A posteriori synthetic.
Synthetic knowledge is after the expereince the type of knowledge is synthetic if the world
changes than the knowledge will be false.
When you ask yourself how is the world it gives you science, and it has a scheme which
organizes your experience and knowledge. When you act you engage in practical reasoning.
A way you can tell if its a priori is if you make judgmenets of the necessity. It happens to be
true. Other types of empirical beliefs you take them as necessary true. For ex. Interior
angles of a triangle is 180 degrees. But it could be not true in a different world.
We compare our future with the present, so how do we know what happenes in the possible
world. Jugdments are not only about the world we live in but also the possible world of
things that could happen. A priori - judgments of necessity. All judgements of causality
A posteriori- from experience.
Modality- reasoning on how to act.
Deonticmodality - they are about ways that we mobilize actions.
Moral philisophy of Deontology - Denot means duty.
Draw a analogy from the necessity function and obligation funtion in governeing our
Obligation is the practical equivalent of necessity.
N = necessary = apodictic
P = Possible = problematic
This is called alethic.
O = Obligatory - you have to do it
P = permissible - you may do it
F = Forbidden - you may not do it.
A particular action is onligatory, it is not persmissible to not perform the action. You are not
allowed to not do it.
All you can get from experience is how things could happen. Obligatory- just looking at how
someone acts it could just be the habit or the costume. The judgment of Obligatoriness are
to strong to derive from expereince they have to be a priori judgements because you have to
do it just by thinking about it.
Reason is not always in control. Reason gives orders.