Is there a mistake in this problem?
52787
If $\bigcup F = A$ then $A\in F$ then prove that $A$ has exactly one element
120460
Spelling or grammar error?
116283
How to properly interpret a seemingly contradictory result in Mathematica?
84747
which of the following satement is true? ..
83542
A natural problem in $\textrm{S}_2^\textrm{P}$?
76630
"An (obvious) problem" or "a (obvious) problem"?
45548
An error in application of Runge's theorem
35484
A question in math mode
85212
Is this a mistake in The Imitation Game?
79648
Found an error in my thesis
98537
What is wrong with the proof?
145955
verifying an incorrect integrating factor
20287
Convergence Problem.
137648
What is the mistake in doing integration by this method?
95145
Does $\exp(2ir\pi)$ equal $1$? What's wrong?
141886
Incorrect notation in math?
34758
Cancellation Law for Direct Sums - What is wrong with this argument?