∉是什么意思 ∩是什么意思
\u2208\u662f\u4ec0\u4e48\u610f\u601d\u6570\u5b66\u7b26\u53f7\u201c\u5c5e\u4e8e"
\u610f\u601d\u662f\u5143\u7d20a\u5c5e\u4e8e\u96c6\u5408S\uff0c\u6bd4\u5982\u8bf4\uff1a\u4e00\u4e2a\u5143\u7d20\u5c5e\u4e8e\u4e00\u4e2a\u96c6\u5408\uff0c\u5982 2\u2208{2\uff0c3\uff0c4}\u3002
a\u2208A\u5c31\u662f\u8bf4a\u5c5e\u4e8e\u96c6\u5408A\uff0c\u5982\u679ca\u2208A\uff0c\u8fd9\u4e2aa\u5c31\u662f\u96c6\u5408A\u7684\u4e00\u4e2a\u5143\u7d20
(-m,1-m)\u8fd9\u4e2a\u533a\u95f4\u53ef\u4ee5\u770b\u6210\u662f\u4e00\u4e2a\u96c6\u5408\uff0c\u5b83\u7684\u5143\u7d20\u662f\u6240\u6709\u5728-m\u548c1-m\u4e4b\u95f4\u7684\u6570\uff0cx\u2208\u3014-m,1-m\u3015\u7684\u610f\u601d\u662fx\u5728\u8fd9\u4e2a\u533a\u95f4\u7684\u8303\u56f4\u5185\uff0c\u5373-m
\u8868\u8fbe\u7b26\u53f7
\u5c5e\u4e8e\uff1a\u2208
\u4e0d\u5c5e\u4e8e\uff1a∉
\u5982\uff0ca\u2208R\uff1aa\u5c5e\u4e8e\u5b9e\u6570 \uff1ba∉N\uff1aa\u4e0d\u5c5e\u4e8e\u81ea\u7136\u6570\u3002
\u5728\u7acb\u4f53\u51e0\u4f55\u4e2d\uff0c\u201c\u2208\u201d\u8fd9\u4e2a\u7b26\u53f7\u7528\u6765\u8868\u793a\u70b9\u4e0e\u76f4\u7ebf\u3001\u5e73\u9762\u4e4b\u95f4\u7684\u4f4d\u7f6e\u5173\u7cfb\u3002
\u4f8b\uff1a
A\u2208l \u5373\u70b9A\u5728\u76f4\u7ebfl\u4e0a
A\u2208\u03b1 \u5373\u70b9A\u5728\u5e73\u9762\u03b1\u4e0a
\u4ee5\u4e0a\u5185\u5bb9\u53c2\u8003\uff1a\u767e\u5ea6\u767e\u79d1-\u5c5e\u4e8e
\u56de\u7b54\uff1a\u2229\u8868\u793a\u7684\u662f\u4ea4\u96c6\u3002\u6bd4\u5982\uff0cA\u2229B\u8868\u793a\u65e2\u5728\u96c6\u5408A\u4e2d\u53c8\u5728\u96c6\u5408B\u4e2d\u7684\u6240\u6709\u5143\u7d20\u7ec4\u6210\u7684\u96c6\u5408\u3002
\u96c6\u5408\u8bba\u4e2d\uff0c\u8bbeA\uff0cB\u662f\u4e24\u4e2a\u96c6\u5408\uff0c\u7531\u6240\u6709\u5c5e\u4e8e\u96c6\u5408A\u4e14\u5c5e\u4e8e\u96c6\u5408B\u7684\u5143\u7d20\u6240\u7ec4\u6210\u7684\u96c6\u5408\uff0c\u53eb\u505a\u96c6\u5408A\u4e0e\u96c6\u5408B\u7684\u4ea4\u96c6\uff08intersection\uff09\uff0c\u8bb0\u4f5cA\u2229B\u3002
\u62d3\u5c55\u8d44\u6599\uff08\u5173\u4e8e\u4ea4\u96c6\u7684\u76f8\u5173\u8d44\u6599\u4ecb\u7ecd\uff09\uff1a
\u96c6\u5408\u8bba\u4e2d\uff0c\u8bbeA\uff0cB\u662f\u4e24\u4e2a\u96c6\u5408\uff0c\u7531\u6240\u6709\u5c5e\u4e8e\u96c6\u5408A\u4e14\u5c5e\u4e8e\u96c6\u5408B\u7684\u5143\u7d20\u6240\u7ec4\u6210\u7684\u96c6\u5408\uff0c\u53eb\u505a\u96c6\u5408A\u4e0e\u96c6\u5408B\u7684\u4ea4\u96c6\uff08intersection\uff09\u3002\u5373\uff1aA\u2229B= {x|x\u2208A\u2227x\u2208B}\u3002 [1]
\u8bb0\u4f5cA\u2229B\uff0c\u8bfb\u4f5c\u201cA\u4e0eB\u7684\u4ea4\u96c6\u201d\u3002
\u4e00\u7cfb\u5217\u96c6\u5408A1\uff0cA2\uff0c\u2026\uff0cAn\u7684\u4ea4\u96c6\u5373A1\u2229A2\u2229\u2026\u2229An\uff0c\u53ef\u8bb0\u4f5c \uff0c \uff0c \u6216
\u8868\u793a\uff08\u5176\u4e2dI\u8868\u793a\u6307\u6807\u96c6\uff09\uff0c\u8bfb\u4f5c\u201c\u8bf8\u96c6A1\uff0cA2\uff0c\u2026\uff0cAn\u7684\u4ea4\u96c6\u201d\u3002
\u6ce8\u610f\u5f53\u7b26\u53f7\u2229\u5199\u5728\u5176\u4ed6\u7b26\u53f7\u4e4b\u524d\uff0c\u800c\u4e0d\u662f\u4e4b\u95f4\u7684\u65f6\u5019\uff0c\u9700\u8981\u5199\u5f97\u5927\u4e00\u53f7\u3002
\u4e3e\u4f8b\uff1a
\uff081\uff09\u96c6\u5408 {1,2,3} \u548c {2,3,4} \u7684\u4ea4\u96c6\u4e3a {2,3}\u3002\u5373{1,2,3}\u2229{2,3,4}={2,3}\u3002
\uff082\uff09\u6570\u5b579\u4e0d\u5c5e\u4e8e\u8d28\u6570\u96c6\u5408 {2,3,5,7,11, ...} \u548c\u5947\u6570\u96c6\u5408 {1,3,5,7,9,11, ...}\u7684\u4ea4\u96c6\u3002\u53739∉{x|x\u662f\u8d28\u6570}\u2229{x|x\u662f\u5947\u6570}\u3002
\u767e\u5ea6\u767e\u79d1\uff1a\u4ea4\u96c6 \uff08\u6570\u5b66\u540d\u8bcd\uff09
不属于的意思
表示一个元素不属于一个集合
某元素不属于该集合
表示不属于
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