Hey!

When we were talking about reasoning I remembered of the famous Philosopher Aristotle. I found this website that explains most of his thoughts and reasoning and in particular the way syllogism works. Here is the introduction to the link

## 3. The Subject of Logic: “Syllogisms”

All Aristotle’s logic revolves around one notion: the **deduction** (*sullogismos*). A thorough explanation of what a deduction is, and what they are composed of, will necessarily lead us through the whole of his theory. What, then, is a deduction? Aristotle says:

A deduction is speech (

logos) in which, certain things having been supposed, something different from those supposed results of necessity because of their being so. (Prior AnalyticsI.2, 24b18–20)

Each of the “things supposed” is a **premise** (*protasis*) of the argument, and what “results of necessity” is the **conclusion** (*sumperasma*).

The core of this definition is the notion of “resulting of necessity” (*ex anankês sumbainein*). This corresponds to a modern notion of logical consequence: X results of necessity from Y and Z if it would be impossible for X to be false when Y and Z are true. We could therefore take this to be a general definition of “valid argument”.

I hope this help clarify and have a better understanding of the topic!

Giulia 🙂