<P>언뜻 생각난 건데요.</P> <P>허수단위 <COMMENT class=MATH>[0]#wh4/13.6`4.8/11,[1]{sqrt{-1}`equal`i}</COMMENT>로 정의 하고</P> <P><COMMENT class=MATH>[0]#wh4/14.2`4.3/11,[1]{i`power`4n`equal`1}</COMMENT>, <COMMENT class=MATH>[0]#wh4/22.3`4.3/11,[1]{i`power`(4n`plus`1)`equal`i}</COMMENT>, <COMMENT class=MATH>[0]#wh4/25.6`4.3/11,[1]{i`power`(4n`plus`2)`equal`-1}</COMMENT>, <COMMENT class=MATH>[0]#wh4/25.1`4.3/11,[1]{i`power`(4n`plus`3)`equal`-i}</COMMENT></P> <P>이잖아요.</P> <P>그러면 <COMMENT class=MATH>[0]#wh4/10.1`5.3/11,[1]{sqrt{sqrt{-1}}}</COMMENT>, 즉 <COMMENT class=MATH>[0]#wh4/4.4`4.8/11,[1]{sqrt{i}}</COMMENT>의 값은 무엇인가요?</P> <P>새로운 수를 또 만들어야 하나요?</P> <P>아니면 복소수만으로도 충분한가요?</P>
