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This rule is used forwards to introduce a new occurance of the "Top" (T) formula, or backwards to immediately justify a "Top" goal.
To use it forwards:
- select both an empty line and Top Introduction.
- a "Top" (T) formula will then be added as a new line to your proof.
To use it backwards:
- select both the "Top" (T) goal line you wish to justify and Top Introduction.
- the goal line will then be justified closing the box it is in (the empty line is removed and the box will turn green).
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