Irony in science or a bad example of Post Hoc

While reading through this excellent website I came across an article about Post Hoc logical fallacy. To freshen your memory, this article describes Post Hoc fallacy as follows:

A Post Hoc is a fallacy with the following form:

1. A occurs before B.
2. Therefore A is the cause of B.

There are also a few examples that help to understand this fallacy. Among these examples there is this one:

Bill purchases a new PowerMac and it works fine for months. He then buys and installs a new piece of software. The next time he starts up his Mac, it freezes. Bill concludes that the software must be the cause of the freeze.

I couldn’t help the smile. In the scope of logic as a science this example perfectly illustrates the point. But in the scope of computer science this quote would be a good example of the opposite. In other words, if you computer worked fine for months and than you installed a new piece of software on it, and it started to freeze – chances are that the software is the cause of problem.

Ironical, isn’t it?

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