What's the difference between catastasis and protasis?

Catastasis

Definition:

• (n.) That part of a speech, usually the exordium, in which the orator sets forth the subject matter to be discussed.
• (n.) The state, or condition of anything; constitution; habit of body.

Example Sentences:

Protasis

Definition:

• (n.) A proposition; a maxim.
• (n.) The introductory or subordinate member of a sentence, generally of a conditional sentence; -- opposed to apodosis. See Apodosis.
• (n.) The first part of a drama, of a poem, or the like; the introduction; opposed to epitasis.

Example Sentences: