I am reading the following document of Solitary waves page $14$. And I found the following symbol $\doteqdot$.
What does $\doteqdot$ mean? For example: $$y_t \doteqdot -c_0y_x $$
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1The relevant information might already be here, but I think that that page you linked is behind a paywall. – Nov 04 '20 at 19:03
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This is Unicode 2251, called "GEOMETRICALLY EQUAL TO". – GEdgar Nov 04 '20 at 19:35
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@Somos You could post that as an answer – Mark S. Nov 04 '20 at 23:36
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After the very first equation (1.1) is this line
breaking occurs for a≑d. ...
so I think that it means "approximately equal to" which is usually written with ≈. I don't know why the author decided to use this symbol. It must be a rare usage because I had not seen it used before.
Somos
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Search "Geometrically equal to" on this page
https://www.w3.org/TR/MathML2/isoamsr.html
I don't know what that means, but it's the right symbol.
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Compare to the similar symbol in the codepoint below that one. I'm pretty sure Somos's comment was right that the meaning here is "approximately equal to" and not "geometrically equal to" (whatever that was intended to mean). In general, the Unicode glosses are not a good reference for all usages of a symbol. – Mark S. Nov 04 '20 at 23:39