User:Johannes Maximilian/CTRL+F

The CTRL+F test can be used to determine whether or not a source is suitable for verification in an article: In Wikipedia articles, all pieces of nontrivial information need to be verifiable. For establishing verifiability, proper sources that discuss or describe a piece of information need to be cited. In order for a source to describe anything that is related to the article's subject, it needs to contain the word used for the article's subject. The easiest way of validating whether or not an online source contains that word is to use the page search function by pressing + (or + on a Mac) and typing in the word for the article's subject. If an online source does not contain the word for the article's subject, there is a high chance that it does not discuss or describe anything related to the article, and that it is, therefore, unsuitable for the article. One must, of course, use the CTRL+F test with reason. There are possible ways for sources to legitimately discuss or describe a piece of information related to an article, without containing the word(s) used as the article's lemma. On the other hand, a source may also contain an article's lemma without actually discussing anything related to the article.

Examples

 * This is a source that discusses the process of differentiation in differential calculus. The source also describes what the differences between differential and integral calculus are. Thus, it could be cited in the integral calculus article.


 * This is also a source that discusses differentiation; however, it does not discuss integration which can be seen with the CTRL+F test. This source should thus not be cited in the integral calculus article.


 * This is an example for a source that discusses Johannes Kepler. Despite containing the word integral, the source does not discuss that Kepler's work Stereometrica Doliorum formed the basis of modern integral calculus. This source should thus not be cited in the integral calculus article.