Hiya
@broalabear
Just wanted to add to what
@Amma Usman has already said. Hoping this makes sense as an explanation for what you should try to do during the assumption section of the WG. Good news is that you're right that this proposed assumption is assumed by the main claim.
An assumption is a statement that the writer/speaker takes for granted in order for another claim to make sense. It’s not stated directly, but it’s essential for the logic of the main claim to hold up. If the proposed assumption turned out to be false, then the main claim/argument would either collapse or at least become much weaker.
One useful way to test whether a statement is an assumption is to imagine what would happen if that proposed assumption were false. I call this the 'negation test'. Ask yourself: if this proposed assumption were false, would the main claim/argument still work? If the answer is no (e.g. if the main claim/argument falls apart), then the proposed assumption IS assumed. If the main statement/argument still works fine, then it’s probably not an assumption.
Let’s take the example you've provided here:
- Main claim: "For humankind to survive, it must colonise other planets."
- Proposed assumption: "There will be a time when the Earth can no longer sustain human life."
Now try negating the proposed assumption. Imagine that the Earth
will always be able to sustain humankind. If that were true, then would we
need to colonise other planets to survive (remember, this is what's being claimed in (1))? Doesn't look like it. Thus, the main claim is significantly weakened/no longer makes sense if we don't accept the proposed assumption.
This method works well in general: take the proposed assumption you're testing, imagine it's false, and see what happens to the main argument/claim. If the whole thing unravels, you've found an assumption. If the argument/claim still stands, then the proposed assumption is very likely not an assumed.
Let me know if you’d like to more examples or if this doesn't make sense.