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Beautiful Language of Mathematics
The Fine-structure Constant

In the Fine-structure Constant formula where:
e is the elementary charge (= 1.602176634×10−19 C exactly)
h is the Planck constant (= 6.62607015×10−34 J⋅s exactly)
ħ = h/2π is the reduced Planck constant (= 6.62607015×10−34 J⋅s / 2π exactly)
c is the speed of light in vacuum (= 299792458 m/s exactly)
ε0 is the electric constant or permittivity in vacuum or free space

The Quadratic Formula
Cauchy's Integral Formula
Double angle formula for Cosines
Gauss' Divergence Theorem
Definition of Christoffel Symbols
Curl of a Vector Field
Standard Deviation
Stephen Hawking's Entropy of a Black Hole