The One-Way Arrow
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
The rule arrow runs one way: from established conditions the conclusion may be drawn — and from an established conclusion, nothing follows about the conditions.
Show
A plant can be overwatered without yellow leaves; the rule licensed one direction of travel only.
Watch for
Running an arrow backward is among the oldest reasoning errors in the species — notation, read carefully, is the vaccine.
Builds on
Unlocks
- Nothing yet depends on this.