MATLAB: In Symbolic Math Toolbox, what does the “integral with horizontal bar” symbol mean

integralsymbol [~]Symbolic Math Toolboxsyms

I am using the 'int' function from the MATLAB Symbolic Math Toolbox to perform Cauchy Principal Value integration. My integral did not evaluate, and the output gives an integral sign which is unfamiliar to me. What does it mean?
syms x
f=cos(x)/(x^2-1);
int(f,x,-Inf,Inf,'Principal',true)

Best Answer

That symbol is sometimes used to denote a Cauchy Principle Value integral. See the "Notation" section in this Wikipedia article:
https://en.wikipedia.org/wiki/Cauchy_principal_value#Notation
In general, Wikipedia articles and LaTeX manuals are a good resource for interpreting the math symbols output by the Symbolic Math Toolbox.
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