I would like to introduce what is mathematics in university to senior-high-school students. In other words, I would like those students who feel interested in math to understand its outline at least. Although it concerns about something elementary or some knowledge, I will lay more stress on how you can form your logic than mathematical logic itself.

 There have passed as long as two decades since my graduation from university, so I cannot remember the exact equations or theories. What to be described below has not been supervised by any math professor, and report or e-mail to me if there is found something wrong. However, check up details for yourselves, because I have now too poor knowledge to answer you any possible questions only to make you disappointed.

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