I don't believe that all questions that are mathematical problems should have the ArXiv two-letter prefixes. The right way of interpreting [nt.number-theory] is that it raises some issue of interest to number theorists. Any question that nearly all final-year undergraduate mathematicians could answer does not deserve these tags.

Example: Why is the decimal representation of 1/7 “cyclical”? has the [nt.number-theory] tag: wouldn't it make more sense if it was tagged [arithmetic] instead? What has this question to do with the distinctive kind of mathematics that number theorists do? I would not expect to see such a question treated in an undregraduate course entitled "Number Theory".

I answered basically this question before, MathOverflow tags + others ?.

I don't believe that all questions that are mathematical problems should have the ArXiv two-letter prefixes. The right way of interpreting [nt.number-theory] is that it raises some issue of interest to number theorists. Any question that nearly all final-year undergraduate mathematicians could answer does not deserve these tags.

Example: Why is the decimal representation of 1/7 “cyclical”? has the [nt.number-theory] tag: wouldn't it make more sense if it was tagged [arithmetic] instead? What has this question to do with the distinctive kind of mathematics that number theorists do? I would not expect to see such a question treated in an undregraduate course entitled "Number Theory".

I answered basically this question before, MathOverflow tags + others ?.

I don't believe that all questions that are mathematical problems should have the ArXiv two-letter prefixes. The right way of interpreting [nt.number-theory] is that it raises some issue of interest to number theorists. Any question that nearly all final-year undergraduate mathematicians could answer does not deserve these tags.

Example: Why is the decimal representation of 1/7 “cyclical”? has the [nt.number-theory] tag: wouldn't it make more sense if it was tagged [arithmetic] instead? What has this question to do with the distinctive kind of mathematics that number theorists do? I would not expect to see such a question treated in an undregraduate course entitled "Number Theory".

I answered basically this question before, MathOverflow tags + others ?.

I don't believe that all questions that are mathematical problems should have the ArXiv two-letter prefixes. The right way of interpreting [nt.number-theory] is that it raises some issue of interest to number theorists. Any question that nearly all final-year undergraduate mathematicians could answer does not deserve these tags.

Example: Why is the decimal representation of 1/7 “cyclical”? has the [nt.number-theory] tag: wouldn't it make more sense if it was tagged [arithmetic] instead? What has this question to do with the distinctive kind of mathematics that number theorists do? I would not expect to see such a question treated in an undregraduate course entitled "Number Theory".

I answered basically this question before, MathOverflow tags + others ?.