For clarity, the original post is asking about mathematical (linear algebra) libraries (usually in FORTRAN or C) that are included with macOS Mojave, specifically LAPACK (Linear Algebra PACKage), BLAS (Basic Linear Algebra Subprograms), and ATLAS (Automatically Tuned Linear Algebra Software). These libraries are included in the Accelerate framework, documentation can be found here: Apple BLAS documentation
On my machine, these are located here: /System/Library/Frameworks/Accelerate.Framework
These libraries are also included in many FORTRAN compiler packages vis-à-vis Intel iFort and the like. They are also available here: LAPACK and BLAS and ATLAS