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Hello, I'm ReferenceBot. I have automatically detected that an edit performed by you may have introduced errors in referencing. It is as follows:

• On the Dos Pueblos High School page, your edit caused an unnamed parameter error (help). (Fix | Ask for help)

Please check this page and fix the errors highlighted. If you think this is a false positive, you can report it to my operator. Thanks, ReferenceBot (talk) 00:27, 16 March 2016 (UTC)[reply]

Hello.

With your last update there is a unuseful redundancy in the History part:

"In Arithmetices Principia: Nova Methodo Exposita (1889), Peano expressed the proposition "If , then " with the symbol Ɔ, which is the opposite of C. He also expressed the proposition as Ɔ .[citation needed] "

The last statement: "He also expressed the proposition as Ɔ." is useless.

The [citation needed] acn be to Peano's [Arithmetices Principia (1889)](https://archive.org/details/arithmeticespri00peangoog/page/n12/mode/2up), page vi: SIGNORUM TABULA (Table of symbols).

Regards mauro 185.51.12.102 (talk) 13:05, 29 July 2025 (UTC)[reply]