This file is indexed.

/usr/share/yacas/base.rep/math.ys.def is in yacas 1.3.1-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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MathSin
MathCos
MathTan
MathArcSin
MathExp
MathPower
MathPi
MathMul2Exp
}