The members MUSTN'T :

- Ask the questions which are Vietnamese or not related to math or nonsense such as 1 + 1 ; ....

- Cheat to get more points such as : telling other members to give you points ; copying the answer of another member ; making more accounts to tick the answers of your main account

Mathulike can subtract the points or lock the account of the doer forever if he/she violated the rules many times.