The Intrinsic Derivation from E₆ Exceptional Simple Lie Group for 中, the Unique Core Constant of Joqhwb Geometric Unified Field Theory: Rigorous Proof of 中≡27/(2π)

This paper aims to mathematically prove the intrinsic origin of $$\boldsymbol{中}$$, the core fundamental constant known as the volume freezing factor in the Joqhwb Geometric Unified Field Theory. The double uniqueness consists of two aspects: mathematical uniqueness derived from the inherent structure of the $$\boldsymbol{E_6}$$ group, and physical uniqueness as the sole core constant. In this way, the mathematical essence of the ontological universe is revealed.