Recently, a question and its variants were posted on MSE (and cross-posted on MO as well, if that matters) using different new user accounts:

1. <https://math.stackexchange.com/questions/1422693/a-question-in-numerical-range>
2. [A question in matrix polynomial](https://mathoverflow.net/questions/217514/a-question-in-matrix-polynomial) (MO)
3. <https://math.stackexchange.com/questions/1422883/a-question-in-numerical-range>
4. <https://math.stackexchange.com/questions/1423773/if-0-notin-wa-m-then-wp-lambda-is-bounded>
5. <https://math.stackexchange.com/questions/1425116/a-question-in-numerical-range-of-matrix-polynomial>
6. <https://math.stackexchange.com/questions/1427028/a-question-in-numerical-range>

Question 2 is identical to question 1 and it was put on hold by some fellow users due to the question's lack of context. Question 3 asks whether the converse of the problem statement in question 1 is true or not. Technically it's not a duplicate, but one can avoid a new question if the "if" in question 1 is simply replaced by "if and only if". Question 4 is essentially question 1, but with a proof attempt (hence it is not "missing context or other details" and it cannot be closed as duplicate because question 1 receives no answer).

No one has yet answered any one of the above questions. I don't feel right about this guerilla tactic, but maybe I'm too pedantic. How to deal with such posting of many slight variants of a question? Is it OK to leave them be?

**Edit:** There is another stream of duplicates of the same theme, posted probably by the same user:

1. <https://math.stackexchange.com/questions/1383030/a-question-in-matrix-polynomial>
2. <https://math.stackexchange.com/questions/1401518/a-question-about-matrix-norm>
3. <https://math.stackexchange.com/questions/1405992/a-question-in-perturbation-of-p-lambda>
4. [A question in compact set](https://mathoverflow.net/questions/215570/a-question-in-compact-set) (MO)
5. <https://math.stackexchange.com/questions/1417453/a-question-on-matrix-norm>
6. [A question on polynomial .](https://math.stackexchange.com/questions/1432344/a-question-on-polynomial)