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Date: Tue, 25 Feb 2025 15:56:36 +0100
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From: kurtz le pirate <kurtzlepirate@free.fr>
Subject: Test FREE - 2025-02-25-15:56
Organization: compagnie de la banquise
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The name derives from the fact that the prototypical example in two 
dimensions is a surface that curves up in one direction, and curves down 
in a different direction, resembling a riding saddle. In terms of 
contour lines, a saddle point in two dimensions gives rise to a contour 
map with a pair of lines intersecting at the point. Such intersections 
are rare in actual ordnance survey maps, as the height of the saddle 
point is unlikely to coincide with the integer multiples used in such 
maps. Instead, the saddle point appears as a blank space in the middle 
of four sets of contour lines that approach and veer away from it. For a 
basic saddle point, these sets occur in pairs, with an opposing high 
pair and an opposing low pair positioned in orthogonal directions. The 
critical contour lines generally do not have to intersect orthogonally.



-- 
kurtz le pirate
compagnie de la banquise