Talk:Johannes Widmann

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[edit] How deliciously obscure...

Is there any way this article can be expanded? 207.62.186.233 (talk) 15:29, 28 February 2008 (UTC)

[edit] addition and subtraction-sign

Afaik it`s not completely clear if he actually had invented them, but they did appear for the first time in his book in printed form. 62.178.137.216 (talk) —Preceding comment was added at 15:00, 23 March 2008 (UTC)