How would you translate this from a deductive argument into propositional logic?

Question

Okay, I'm working on an assignment in which I need to translate deductive arguments into propositional logic.

The first question is:
"I do know that this pencil exists, but I could not know this if Hume's principles were true. Therefore Hume's principles are false."

I realize you don't want to answer my assignment for me, and that's not what I want either,I just need to know how to do it myself. I don't really completely understand what a deductive argument and propositional logic are, so if someone could explain that, and possibly either make up a deductive argument and then translate it for me, or use the example I've provided, that would be great.

Thanks!
-Randall

Answer 1

Very easy question>
If the pen or that pen AFFECTS your life, therefore is very REAL!

Somewhere in world in, then and now, was to write your name with that pencil, accusing you of missdeeds, believe me my friend, your a$$ would be on the line as we speak!

Answer 2

To use your example:

1. I have knowledge that object X exists.
2. If Hume's principles are true, then I cannot have knowledge that object X exists
3. Hume's principles are not true.

In logic this reduces to the following form:

1. If B, then not A.
2. A.
3. Therefore, not B.