The PMMU and math coprocessor (also known as FPU) perform very different functions. The PMMU handles memory management, while the math coprocessor handles arithmetic functions handed off to it from the microprocessor.
To tell if your computer has a PMMU installed, you must run a diagnostic utility which has this capability. Apple Personal Diagnostics, MacEnvy or other similar utility can inform you if your computer has a PMMU installed.