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Martin Sleziak
Martin Sleziak
10:27 AM
@NikeDattani Maybe it is something you know, but I will mention that chat messages can be oneboxed, too.
I saw your messages in the MO room:
in MathOverflow, 2 days ago, by Nike Dattani
Apparently Gauss used it in 1818 when surveying Hanover, but there's no reference for it yet: https://chat.stackexchange.com/transcript/message/55406053#55406053
If you posted the link to a chat message separately (i.e., as a message containing nothing but the link), then the content of the message would be visible too:
in Ten fold, 2 days ago, by whuber
If the formula is meant in a narrower sense--it must involve concepts of partial differentiation of arbitrary multivariate nonlinear functions--then I suspect Gauss was using it by 1818 in his survey of the Hanover area.
 

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