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For these to exist we would need to define `_USE_MATH_DEFINES` before `cmath` or `math.h` is first included. However, we don't control the include order for projects outside Eigen, so even defining the macro in `Eigen/Core` does not fix the issue for projects that end up including `<cmath>` before Eigen does (explicitly or transitively). To fix this, we define `EIGEN_LOG2E` and `EIGEN_LN2` ourselves.