Which step is incorrect?
3712
Why $\sqrt{-1 \cdot {-1}} \neq \sqrt{-1}^2$?
118750
How should I correct my spoken error?
98560
"Amendment" or "Addendum" for book correction
124477
Do we say and write 21 / 31 / 41 item or itemS?
64805
How to calculate relative error when true value is zero?
92469
"right" vs "correct"
137648
What is the mistake in doing integration by this method?
134517
Is following contradictory? Can you give an example?
62867
Is $E^2=(mc^2)^2+(pc)^2$ correct, or is $E=mc^2$ the correct one?
156569
The first and (the) second chapter(s) are difficult - which is correct?
25564
What is the optimal order of post-processing steps?
136914
What do these steps in Pokémon Go mean?
51307
"Neither Michael nor Albert is correct" or "Neither Michael nor Albert are correct"?
39234
Is "errored" correct usage?
142929
Problem with the nomenclature?
3283
Proper placement of "exactly"?
98537
What is wrong with the proof?