For faster navigation, this Iframe is preloading the Wikiwand page for
模板:Ifnotempty/doc.
在逻辑学、哲学、语言学中,命题(英语:proposition)是一个陈述句所表达的判断,具有真值,即不是真的就是假的。例如,“雪是白色的”。命题不等同于句子,例如,“雪是白色的”和“白色是雪的颜色”是不同的句子,但它们判断相同的事,是相同的命题;同时,命题也不依赖于语言,不同的语言可以表达相同的命题,例如,“雪是白的”和“Snow is white”是相同的判断。疑问句、祈使句、感叹句都不能表达命题。
由其他命题推出命题(前提推出结论)的过程,叫做推论;而这些作为前提和结论的命题的集合,叫做论证。命题逻辑主要处理命题及其之间的逻辑关系。
一些哲学家,诸如约翰·瑟尔,认为其他形式的语言或行为也判定命题。是非疑问句是对命题真值的询问。道路交通标志不通过语言和文字也表达了命题。使用陈述句也可能给出一个命题而不判定它,例如,在当老师请学生对某个引用发表意见的时候,这个引用就是一个命题(即它有语义)而这个老师并没有判定它。在上一段中,只给出了命题雪是白的,但没有判定它。
{{bottomLinkPreText}}
{{bottomLinkText}}
This page is based on a Wikipedia article written by
contributors (read/edit).
Text is available under the
CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.
{{current.index+1}} of {{items.length}}
Thanks for reporting this video!
This browser is not supported by Wikiwand :(
Wikiwand requires a browser with modern capabilities in order to provide you with the best reading experience.
Please download and use one of the following browsers:
An extension you use may be preventing Wikiwand articles from loading properly.
If you're using HTTPS Everywhere or you're unable to access any article on Wikiwand, please consider switching to HTTPS (https://www.wikiwand.com).
An extension you use may be preventing Wikiwand articles from loading properly.
If you are using an Ad-Blocker, it might have mistakenly blocked our content.
You will need to temporarily disable your Ad-blocker to view this page.
✕
This article was just edited, click to reload
Please click Add in the dialog above
Please click Allow in the top-left corner,
then click Install Now in the dialog
Please click Open in the download dialog,
then click Install
Please click the "Downloads" icon in the Safari toolbar, open the first download in the list,
then click Install
{{::$root.activation.text}}
Follow Us
Don't forget to rate us
Oh no, there's been an error
Please help us solve this error by emailing us at
support@wikiwand.com
Let us know what you've done that caused this error, what browser you're using, and whether you have any special extensions/add-ons installed.
Thank you!