Thank you. I've just read several pdf and the guide here. I should have found that solution by myself.mfb said:
The "does not divide" symbol in LaTex is represented by \not|\ or \nmid and is used to indicate that one number does not evenly divide another number. For example, 5 does not divide 11.
To use the "does not divide" symbol in your LaTex document, you can use the command \not| or \nmid followed by a space and the number you want to indicate is not divisible. For example, 5 \not| 11 will produce 5 does not divide 11.
The symbol for "is not congruent to" in LaTex is represented by \not\equiv and is used to indicate that two numbers are not congruent. For example, 5 is not congruent to 11.
To type the "is not congruent to" symbol in LaTex, you can use the command \not\equiv followed by a space and the numbers you want to indicate are not congruent. For example, 5 \not\equiv 11 will produce 5 is not congruent to 11.
Yes, there are other symbols in LaTex that are similar to "does not divide" and "is not congruent to" such as \nparallel for "not parallel to" and \neq for "not equal to". These symbols follow a similar structure of \not followed by the symbol for the operation.