Mathematics
Undergraduate
(2)の回答をお願いします
間 1.8. 部分集合 4,お こRR について, 次を示せ :
(1) sup 4, inf 玉 がともに存在するとき,
vee 4Vb eg(eくの) ユ sup4Sinf万.
(2) sup 4 佐 4
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