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§1.1-1-1.11.17325033451},3,2,1{L=Ω}8,,3,2,1{L=Ω2}5010050,,503,502,501,0{×=ΩL3}18,,5,4,3{L=Ω4),(yx122≤+yx}1|),({22≤+=Ωyxyx5πzyx,,π=++zyx}0,0,0,|),,({=++=Ωzyxzyxzyxπ.2.CBA,,CBA,,1B2CBA,,3CBA,,4CBA,,5CBA,,6CBA,,7CBA,,1CBA2CBA3ABC4ABCCBA∪∪5CBA∪∪ABCBCACBACABCBACBACBA∪∪∪∪∪∪§1.1-2-6CBACBACBA∪∪7CBACBACBACBA∪∪∪.3.A“”AD(A)(B)(C)(D)4.{=A}{=B}{=C1999}1CBA∩∩2AABC=3BC⊂4BA=1CBA∩∩{19991999}2AABC=BCA⊂{1999}3BC⊂199919994BABA⊂⇔=AB⊂BA=BA=BABA⊂⇔=⇔AB⊂BA=5.1)()()()(BABABAAB∪∪∪2)()())((BABABABA∪∪∪∪∪∪1Ω=∪=∪∪∪=∪∪∪AAABBBBABABABAAB)()()()()()(§1.1-3-2)()()()()())((BABABAABABABABA∪∪∪=∪∪∪∪∪∪BBBBAAB=∪=∪∪=)(.6.1BBABA∪=∪2BABABABA=∪=∪−)(1BABABBBABBABBABBA∪==∪=∪=∪∪=∪)(2BBABBAAABBAABABABABA∪=∪∪=∪∪=∪=∪−)()(1BABABA∪=∪−)(BABABABA=∪=∪−)(.