切向量

切向量是一个沿着曲线或曲面在给定点的方向：

  • 曲线的微分几何，描述了 Rn 中的曲线的切向量；
  • 切空间，流形理论中的一般概念。
这个消歧义页列出了具有相同或相似标题的数学条目。
如果您是通过某条目的内部链接转到本页，希望您能协助更正该处的内部链接，将它直接指向正确的条目。
检索自“https://zh.wikipedia.org/w/index.php?title=切向量&oldid=25511031”

    • EN TR JP RU DE

    €4.95 / month

    • Favourites List
    • Audio Listining
    • Color Mode
    • Monthly New Updates

    A PHP Error was encountered

    Severity: Notice

    Message: Undefined variable: userid

    Filename: user/popup_modal.php

    Line Number: 68

    Backtrace:

    File: /var/www/wikizero/data/www/wikizero.com/application/views/user/popup_modal.php
    Line: 68
    Function: _error_handler

    File: /var/www/wikizero/data/www/wikizero.com/application/views/page/index.php
    Line: 478
    Function: view

    File: /var/www/wikizero/data/www/wikizero.com/application/controllers/Main.php
    Line: 107
    Function: view

    File: /var/www/wikizero/data/www/wikizero.com/index.php
    Line: 315
    Function: require_once

    ">

    €4.95

    € 9.90 /

    Modal title
    切向量" id="cancelSubscription" name="cancelSubscription" class="mb-0">

    A PHP Error was encountered

    Severity: Notice

    Message: Undefined variable: user_membership

    Filename: user/popup_modal.php

    Line Number: 192

    Backtrace:

    File: /var/www/wikizero/data/www/wikizero.com/application/views/user/popup_modal.php
    Line: 192
    Function: _error_handler

    File: /var/www/wikizero/data/www/wikizero.com/application/views/page/index.php
    Line: 478
    Function: view

    File: /var/www/wikizero/data/www/wikizero.com/application/controllers/Main.php
    Line: 107
    Function: view

    File: /var/www/wikizero/data/www/wikizero.com/index.php
    Line: 315
    Function: require_once

    A PHP Error was encountered

    Severity: Warning

    Message: Invalid argument supplied for foreach()

    Filename: user/popup_modal.php

    Line Number: 192

    Backtrace:

    File: /var/www/wikizero/data/www/wikizero.com/application/views/user/popup_modal.php
    Line: 192
    Function: _error_handler

    File: /var/www/wikizero/data/www/wikizero.com/application/views/page/index.php
    Line: 478
    Function: view

    File: /var/www/wikizero/data/www/wikizero.com/application/controllers/Main.php
    Line: 107
    Function: view

    File: /var/www/wikizero/data/www/wikizero.com/index.php
    Line: 315
    Function: require_once

    A PHP Error was encountered

    Severity: Notice

    Message: Undefined variable: userid

    Filename: user/popup_modal.php

    Line Number: 208

    Backtrace:

    File: /var/www/wikizero/data/www/wikizero.com/application/views/user/popup_modal.php
    Line: 208
    Function: _error_handler

    File: /var/www/wikizero/data/www/wikizero.com/application/views/page/index.php
    Line: 478
    Function: view

    File: /var/www/wikizero/data/www/wikizero.com/application/controllers/Main.php
    Line: 107
    Function: view

    File: /var/www/wikizero/data/www/wikizero.com/index.php
    Line: 315
    Function: require_once

    ">

    Harry Potter Books

    A PHP Error was encountered

    Severity: Notice

    Message: Undefined variable: products

    Filename: user/popup_harry_book.php

    Line Number: 24

    Backtrace:

    File: /var/www/wikizero/data/www/wikizero.com/application/views/user/popup_harry_book.php
    Line: 24
    Function: _error_handler

    File: /var/www/wikizero/data/www/wikizero.com/application/views/page/index.php
    Line: 479
    Function: view

    File: /var/www/wikizero/data/www/wikizero.com/application/controllers/Main.php
    Line: 107
    Function: view

    File: /var/www/wikizero/data/www/wikizero.com/index.php
    Line: 315
    Function: require_once

    A PHP Error was encountered

    Severity: Warning

    Message: Invalid argument supplied for foreach()

    Filename: user/popup_harry_book.php

    Line Number: 24

    Backtrace:

    File: /var/www/wikizero/data/www/wikizero.com/application/views/user/popup_harry_book.php
    Line: 24
    Function: _error_handler

    File: /var/www/wikizero/data/www/wikizero.com/application/views/page/index.php
    Line: 479
    Function: view

    File: /var/www/wikizero/data/www/wikizero.com/application/controllers/Main.php
    Line: 107
    Function: view

    File: /var/www/wikizero/data/www/wikizero.com/index.php
    Line: 315
    Function: require_once