Use Sider's semantic validity proof method to prove valid in system K the following modal wffs: 1. (O(A) B) & CA) > OB 2
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Use Sider's semantic validity proof method to prove valid in system K the following modal wffs: 1. (O(A) B) & CA) > OB 2
Use Sider's semantic validity proof method to prove valid in system K the following modal wffs: 1. (O(A) B) & CA) > OB 2. O(A) B) ) (OA) DB) 3. DO (A&B) > ODA
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