Rule of Assumption/Explanation
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Let the Rule of Assumption be invoked.
It does not matter whether the assumption is true -- all we are concerned about is making sure that any conclusion based on the assumptions made is as the result of a valid argument.
The introduction of an assumption $\phi$ into an argument by means of the Rule of Assumption can be interpreted in natural language as:
- "Suppose it were true that $\phi$"
- "What if $\phi$ were true?"