Chapter II: Introduction

OUR PROBLEM DEFINED BY ITS RELATIONS TO LOGIC,
PSYCHOLOGY AND MATHEMATICS.
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1. The problem first received a modern form through Kant, who
connected the _à priori_ with the subjective 1

2. A mental state is subjective, for Psychology, when its immediate
cause does not lie in the outer world 2

3. A piece of knowledge is _à priori_, for Epistemology, when
without it knowledge would be impossible 2

4. The subjective and the _à priori_ belong respectively to
Psychology and to Epistemology. The latter alone will be
investigated in this essay 3

5. My test of the _à priori_ will be purely logical: what knowledge
is necessary for experience? 3

6. But since the necessary is hypothetical, we must include, in
the _à priori_, the ground of necessity 4

7. This may be the essential postulate of our science, or the
element, in the subject-matter, which is necessary to
experience; 4

8. Which, however, are both at bottom the same ground 5

9. Forecast of the work 5