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zaq123321

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Not really. What is a set? Something put together.

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2Â¥2016-04-21 19:28:12
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2Â¥: Originally posted by zaq123321 at 2016-04-21 19:28:12
Not really. What is a set? Something put together.

×Ü¿ÉÒÔÒ»¸öorder relation on a set£¿²»¹Üʲô¼¯ºÏ£¿

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3Â¥2016-04-21 21:35:42
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ÁøÈô·çÆ®: ½ð±Ò+4, ¡ï¡ï¡ïºÜÓаïÖú 2016-04-22 06:06:15
If you can, then the set is called an ordered set. Whether you can or not, it depends. I believe there is no claim that every set must have an order or suborder.

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puss_m

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5Â¥2016-04-22 19:54:02
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jiajiasnoopy

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5Â¥: Originally posted by puss_m at 2016-04-22 19:54:02
²¢²»ÊÇÿ¸ö¼¯ºÏ¶¼Äܶ¨ÒåÐò£¬¿ÉÒÔÄø´Êý¼¯ºÏ×÷ΪÀý×Ó¡£¼Ù¶¨¸´ÊýÓòÊÇÓÐÐòµÄ£¬ÄÇô±ØÓÐx^2>=0.this contradict with the fact  i*i =-1.

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xytcmath

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Well-ordering theorem: If A is a set, there exists an order relation on A that is a well-ordering.

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7Â¥2016-04-24 08:34:20
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xytcmath

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8Â¥2016-04-24 08:35:34
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ÒýÓûØÌû:
7Â¥: Originally posted by xytcmath at 2016-04-24 08:34:20
Well-ordering theorem: If A is a set, there exists an order relation on A that is a well-ordering.

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9Â¥2016-04-24 09:17:22
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