1. I had taken (and passed) some undergraduate courses for math majors before leaving school and joining compulsory military service in Taiwan. After that currently I am not yet a formally registered student of any school. But I am auditing (and 2nd learning from) another undergraduate courses for math majors in a public university in Taiwan.
  2. Please do not falsely assume I have full access to formal education when commenting on my questions, strictly speaking I am still a self-learner.
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