Since we know that the first is true, what do you make of the second?" The bottom line, though, is "when the first thing is true, the second is, too. The first long and haunting sentence basically serves to tell you "heroes, there is a dark and menacing-looking forest ahead of you. In fact, we could go straight to the last two sentences here to get to the point. Now I don't know about you, but when I see phonetic symbols and words that I have no idea what they mean – but someone is telling me I should – my heart skips a beat. Modus ponens is defined in Wikipedia as follows: In propositional logic, modus ponens (/ˈmoʊdəs ˈpoʊnɛnz/ MP), also known as modus ponendo ponens (Latin for "method of putting by placing") or implication elimination or affirming the antecedent, is a deductive argument form and rule of inference. Let's begin with the really tough ancient Latin names: Modus Ponens and Modus Tollens. Modus Ponens, Modus Tollens, Hocus Pocus, Abracadabra. You just skip the part of using a fancy name and giving a complicated explanation for the process itself. I will try to avoid the fancy metalanguage and present you with a couple of examples to help show you that you already think the way the Logic subject presents to you. SO, let me try to show you in this article some of these rules of propositional logic. Having had good results in Logic back then, I was shocked with how my classmates talked about Logic on social media (sentences like "this is not a topic for first term – it's too hard", or "why do they expect me to learn Latin? This is the 21 st century!" were common).įortunately for me, instead of focusing on the naming of each inference rule I heard of, I decided to focus on understanding what each one led to – which probably made me worry less about the topic than my peers.Įrgo… □ just kidding. Intense practice with examples, however, can help students learn much more quickly than filling up their hard drive with vocabulary they'll probably only use to pass the tests and then never use again – except in those word game puzzles. And it has its charm in the sense of categorizing things. In this case, it can be roughly translated as "fancy language to talk about a topic that makes it harder for the students to understand what the thing really is". The professors used Latin expressions like " modus ponens" and " modus tollens" to define some sort of processes of inferring a result, and these often caused people to complain about the "esoteric nature" of the subject. What could be the reason for that? The only thing, in theory, that might prove troublesome was the amount of unfamiliar terminology involved in propositional logic. Shockingly enough, in the same way people have a hard time with Math in college, Logic was the subject back then where students failed the most. After all, we are all taught how to think throughout school and, since all of us "think", there would be nothing unfamiliar in the subject that could trick the less-than-alert mind. In the "I think, therefore I am" fashion, you might think this would be an easy subject. In the first term of college, I was introduced to a subject called Logic. It may sound surprising, but you already have all it takes to produce high-level logic: right behind your eyes.
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