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I came across a new symbol in the paper Design-order, non-conformal low-Mach fluid algorithms using a hybrid CVFEM/DG approach by Stefan P. Domino. What does this symbol mean? It looks like it's being used as an equals sign here...

Here is the set of equations for context:

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2 Answers

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This looks like $\pm$ ("plus or minus") to me.

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This is the same $\pm$ as used in the well-known formula for the roots of a quadratic polynomial,

$$\frac{-b\pm\sqrt{b^2-4ac}}{2a}.$$

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