Regarding the antiquity of the + and - signs. Origin of quid vides.
Letter details
Record number
Herschel7172
From
Augustus De Morgan
To
Sir John Herschel
Date
[13 September 1864]
Sent from
91 Adelaide Road
Source of text
RS:HS 6.374
Physical description
ALS 6pp
Additional information
Record created for the Calendar of the Correspondence of Sir John Herschel (CUP: Cambridge), 1998 by
Michael J. Crowe ed., David R. Dyck and James J. Kevin assoc. eds
Digital record created by
Dr Marvin Bolt and Steven Lucy at the Webster Institute of the Adler Planetarium
Converted to TEI by
Michael Hawkins, Epsilon Project, Cambridge University Library