A common logical fallacy

Описание: A fallacy I hear all the time is the fallacy of composition. A good example of this is where someone says “some of this political group are evil, so the whole group is evil”. They infer directly from some individuals of a group that the whole group must share that property. The whole group could be evil, but it is not shown through this argument.

Here is a simple example of the same reasoning that is obviously incorrect. I can form a square with two triangles. The fallacy of composition would be to say “one of those triangles has three sides, so the square as a whole must have three sides”. This obviously does not follow: the square has four sides.

So watch out for this fallacy in the wild.

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