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Poll Results

Poll 6: What's the most obscure equation you recognise and understand?

Total votes: 682

THAC0 = 21 - level - hit bonus   156 (22.9%)  
Recreation: To Hit Armour Class 0 score for a warrior in Advanced Dungeons & Dragons, 2nd Edition.
d/dx ln(x) = 1/x94 (13.8%)  
Calculus: The derivative of the natural logarithm function is an hyperbola.
xn + ynzn, for n > 270 (10.3%)  
Number theory: Fermat's Last Theorem.
sin2θ + cos2θ = 154 (7.9%)  
Trigonometry: One of the most fundamental identities.
E = mc240 (5.9%)  
Special relativity: Einstein's famous mass-energy equation.
N = R* fp ne fl fi fc L37 (5.4%)  
Astrobiology: The Drake equation.
e + 1 = 034 (5.0%)  
Complex analysis: Euler's identity.
BMI = w/h227 (4.0%)  
Health: The formula to calculate Body Mass Index.
1 + 1 = 223 (3.4%)  
Arithmetic: A simple addition.
s->c_str()[s->size()] == '\0'22 (3.2%)  
Computer science: The element of a C-style C++ string at index equal to the string length is a null character.
2H2 + O2 → 2H2O22 (3.2%)  
Chemistry: Hydrogen and oxygen make water by combustion.
HΨ = ih/2π d/dt Ψ22 (3.2%)  
Quantum mechanics: The Schrödinger wave equation.
Eik = 8πG/c4 tik14 (2.1%)  
General relativity: Einstein's field equation.
c = 12 (1.8%)  
Wave motion: Speed of light is the frequency multiplied by the wavelength.
2Φ = 011 (1.6%)  
Differential equations: Laplace's equation.
a2 = b2 + c211 (1.6%)  
Geometry: Pythagoras' theorem for right angled triangles.
Tr{F/Q} = ∑ni=1 σi(f)10 (1.5%)  
Algebra: Trace of an element in a number field as an extension of the rationals.
E.dA = q/ε10 (1.5%)  
Electromagnetism: Gauss' law.
F = ma7 (1.0%)  
Dynamics: Newton's Second Law
B = P(1 + r/n)nt6 (0.9%)  
Economics: Compound interest formula.

I've reformatted the equations to look nicer than the raw ASCII in the poll drop-down list.

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