## Dave’s not here

#### I’ve been there though

 Dave at Home Photographs Black and White Philately Family recipes Glaucoma Contact Dave About Dave Site Map
 Beautiful Math Using MathJax. Rendering will be enhanced if high-quality math fonts (e.g., STIX) are available in your browser. The Quadratic Formula $x=−b±b2−4ac2a$ Cauchy's Integral Formula $f(a)=∮γf(z)z−adz$ Double angle formula for Cosines $cos⁡(θ+φ)=cos⁡(θ)cos⁡(φ)−sin⁡(θ)sin⁡(φ)$ Gauss' Divergence Theorem $∫D(∇⋅F)dV=∫∂D F⋅ndS$ Curl of a Vector Field $∇→×F→=(∂Fz∂y−∂Fy∂z)i+(∂Fx∂z−∂Fz∂x)j+(∂Fy∂x−∂Fx∂y)k$ Standard Deviation $σ=1N∑i=1N(xi−μ)2.$ Definition of Christoffel Symbols $(∇XY)k=Xi(∇iY)k=Xi(∂Yk∂xi+ΓimkYm)$ Generating Entangled Qubits from the Wolfram Demonstrations Project by Brad Rubin