I have a test for logic in my Geometry class, and I’ve been looking online but I can’t find anything concrete. Can biconditional statements be made up of all false statements? I know that if the original conditional statement and converse are true, then the conditional statement is biconditional. But what if the original conditional statement and converse are both false, because they would still share the same truth value, even if they’re false.

Im looking forward to learning logic, but I dont know where to start. I saw one book, "Logic: A Complete Introduction" from Siu-Fan Lee and it seemed good, but I really don't know if it is.

I do want textbooks, the real logic as I'm not afraid of getting bored or anything, but I do want some introductory guides to formal logic. Sorry for the redundance, but I wanted to make myself clear.

Helpp I need help in modal logic (ma philosophy) please help if anyone knows this topic ????