Wikipedia:Articles for deletion/Interchange lemma for context-free languages

The following discussion is an archived debate of the proposed deletion of the article below. Please do not modify it. Subsequent comments should be made on the appropriate discussion page (such as the article's talk page or in a deletion review). No further edits should be made to this page.

The result was keep. Reliable sources that support this subject have been presented during the AfD discussion. (non-admin closure) Steve Quinn (talk) 04:59, 14 March 2019 (UTC)[reply]