Definition of "dx" [dx]

• Differentiation with respect to x (noun)
• A Roman numeral representing five hundred and ten (510). (noun)
• Dx (abbreviation)

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• "What is confusing and perhaps I am simply misinterpreting what Arthur Smith says above, is that he seems to indicate that his dx is a vector: "Perhaps my vector dx notation for a surface element isn't the usual convention""
• "But we still speak of a small increment or patch of solid angle, just like in the vector case the dx is a small increment of the vector x, in two parts."
• "The integral in equation 6 uses dx, which is clearly an area here, because x is a location on a surface."