| 查看: 615 | 回复: 3 | ||||
[交流]
理解不上了
|
|
Suppose that the following conditions are met: . Each element of a set consists of k distinguishable parts x1, . . . , xk. . There are n1 possibilities for the first part x1. . For each i = 2, . . . , k and each combination (x1, . . . , xi−1) of the first i − 1parts, there are ni possibilities for the ith part xi . Under these conditions, there are n1 . . . nk elements of the set. The third condition requires only that the number of possibilities for xi be ni no matter what the earlier parts are. For example, for i = 2, it does not require that the same n2 possibilities be available for x2 regardless of what x1 is. It only requires that the number of possibilities for x2 be n2 no matter what x1 is. for example 后面的怎么理解不上来呢？请帮忙啊！ |
回复此楼» 猜你喜欢
求调剂
已经有4人回复
-
一志愿北京化工大学070300 学硕336求调剂
已经有6人回复
-
考研调剂
已经有3人回复
-
能源材料化学课题组招收硕士研究生8-10名
已经有16人回复
-
318求调剂
已经有5人回复
-
285求调剂
已经有5人回复
-
306求调剂
已经有3人回复
-
354求调剂
已经有10人回复
-
303求调剂
已经有5人回复
-
环境学硕288求调剂
已经有4人回复
zaq123321
专家顾问 (著名写手)
-
专家经验: +342 - 数学EPI: 6
- 应助: 298 (大学生)
- 贵宾: 0.247
- 金币: 11336.3
- 红花: 29
- 帖子: 1221
- 在线: 538.8小时
- 虫号: 405284
- 注册: 2007-06-17
- 性别: MM
- 专业: 生物大分子结构与功能
- 管辖: 数学
★ ★
小木虫: 金币+0.5, 给个红包，谢谢回帖
wzh0408: 金币+1, ok 2014-10-16 22:21:29
小木虫: 金币+0.5, 给个红包，谢谢回帖
wzh0408: 金币+1, ok 2014-10-16 22:21:29
| It basically means x1,x2,...,xk are independent. That means x1 can equal, eg, 1,2, ..., 10. x2 can also equal 1,2, ..,8. x3 can also equal 2,..,10. Then the set can have duplicated elements, which is not the usual set as we have before. |
2楼2014-10-14 03:47:50
3楼2014-10-16 23:41:17
大内总管
木虫 (职业作家)
- 应助: 4 (幼儿园)
- 金币: 3205.2
- 散金: 15
- 红花: 4
- 沙发: 6
- 帖子: 3201
- 在线: 129.9小时
- 虫号: 3221406
- 注册: 2014-05-20
- 专业: 凝聚态物性 II ：电子结构
4楼2014-10-17 14:32:24
