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References to 'signum function'
1. Bolzano's theorem by pahio
2. calculation of Riemann--Stieltjes integral by pahio
3. differentiation under the integral sign by stevecheng
4. discontinuous by mathwizard
5. field homomorphisms fix prime subfields by Wkbj79
6. Heaviside step function by Koro
7. Leibniz' estimate for alternating series by pahio
8. octant by pahio
9. proof of Chernoff-Cramer bound by Andrea Ambrosio
10. quadratic curves by pahio
11. taking square root algebraically by pahio