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A comment on The Most Common Errors in Undergraduate Mathematics (2009). Parent comment

Re:The Most Common Errors in Undergraduate Mathematics (2009) by watwut on Thursday November 19, 2020 @12:58PM (#25152228)
When you are doing equality and such all steps are reversible.

Working backwards is exactly the same as working forward. You develop reasoning where you see it easier until to figure out to connect sides.

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Re:The Most Common Errors in Undergraduate Mathematics (2009) by Caylio on Friday November 20, 2020 @01:12AM (#25157747)
Having equality signs at each step does not mean you can reverse the steps. You need bidirectional implication for that.
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