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| Didn't read the question properly. | | | | | | | | | | | | | | | | |
| Didn't copy down the details correctly. | | | | | | | | | | | | | | | | |
| Typo in the question/paper. | | | | | | | | | | | | | | | | |
| Work for ages and prove 0 = 0. | | | | | | | | | | | | | | | | |
| Sign error. | | | | | | | | | | | | | | | | |
| Get stuck for ages when reading because you don't see why something is true; it is explained in the next paragraph. | | | | | | | | | | | | | | | | |
| Work for ages then find a 1 line proof that the entire method is doomed to fail. | | | | | | | | | | | | | | | | |
| Work for ages, then find a trivial proof. | | | | | | | | | | | | | | | | |
| Prove something trivial via a long and complicated method. | | | | | | | | | | | | | | | | |
| Tried to prove something you didn't need to. | | | | | | | | | | | | | | | | |
| Tried to prove something false. | | | | | | | | | | | | | | | | |
| Your technique works so well that it proves false things. | | | | | | | | | | | | | | | | |
| Assume something false. | | | | | | | | | | | | | | | | |
| Assume something equivalent to the result. | | | | | | | | | | | | | | | | |
| Use a theorem without checking the hypotheses apply. | | | | | | | | | | | | | | | | |
| Forget to deal with all of the cases. | | | | | | | | | | | | | | | | |
| Convince yourself your proof is correct when it isn't. | | | | | | | | | | | | | | | | |
| Invent your own notation, which screws you up. | | | | | | | | | | | | | | | | |
| Prove math inconsistent. | | | | | | | | | | | | | | | | |
| Prove yourself inconsistent. | | | | | | | | | | | | | | | | |
| Forget to drink your coffee. | | | | | | | | | | | | | | | | |
| Getting distracted. | | | | | | | | | | | | | | | | |
| Getting bored. | | | | | | | | | | | | | | | | |
| Apathy. | | | | | | | | | | | | | | | | |
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