Posted per FL's request. -------- Forwarded Message -------- Subject: Scheffer stroke Date: Mon, 27 Apr 2020 19:21:36 +0200 (CEST) From: fl To: Megill Norman
Hi Norm, can you post this: In the commentary it is saïd that it is Russel and Whitehead who discovered that NAND can be used as the one connector necessary to define the other ones. According to Wikipedia (article "Scheffer stroke") it is Scheffer who discovered this fact in 1913. Maybe the commentary should be fixed. Whitehead and Russel made a reference to this discovery in the second edition of Principia Mathematica in the 20s. -- FL -- You received this message because you are subscribed to the Google Groups "Metamath" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/metamath/b887cf41-e918-4a5c-86d7-ea84fd27b0cb%40googlegroups.com.
