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Exercise 5.1 Model Answer

Consider this argument, we we have encountered previously.

Now consider this rebuttal:

1. Decide whether the rejoinder is a premise objection or an inference objection.
2. If it is an inference objection, produce an argument map showing the inference objection as an objection to a co-premise.

The rejoinder is a premise objection. 

The rejoinder provides evidence that the stated premise, i.e.,

The astronauts seem well-lit at times when they should be in shadow.

is false.  Specifically, it objects to the "at times when they should be in shadow" part of it.  The astronauts should not be in shadow, because they would be lit up by reflected light from the lunar surface.

An argument map would look like this:

 Last updated 27-Mar-2007