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## Poll Results

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

 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/x 94 (13.8%) Calculus: The derivative of the natural logarithm function is an hyperbola. xn + yn ≠ zn, for n > 2 70 (10.3%) Number theory: Fermat's Last Theorem. sin2θ + cos2θ = 1 54 (7.9%) Trigonometry: One of the most fundamental identities. E = mc2 40 (5.9%) Special relativity: Einstein's famous mass-energy equation. N = R* fp ne fl fi fc L 37 (5.4%) Astrobiology: The Drake equation. eiπ + 1 = 0 34 (5.0%) Complex analysis: Euler's identity. BMI = w/h2 27 (4.0%) Health: The formula to calculate Body Mass Index. 1 + 1 = 2 23 (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 → 2H2O 22 (3.2%) Chemistry: Hydrogen and oxygen make water by combustion. HΨ = ih/2π d/dt Ψ 22 (3.2%) Quantum mechanics: The Schrödinger wave equation. Eik = 8πG/c4 tik 14 (2.1%) General relativity: Einstein's field equation. c = fλ 12 (1.8%) Wave motion: Speed of light is the frequency multiplied by the wavelength. ∇2Φ = 0 11 (1.6%) Differential equations: Laplace's equation. a2 = b2 + c2 11 (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/ε 10 (1.5%) Electromagnetism: Gauss' law. F = ma 7 (1.0%) Dynamics: Newton's Second Law B = P(1 + r/n)nt 6 (0.9%) Economics: Compound interest formula.
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