Pete Markou

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 Apr12 comment Let $f:[a,b]\to\mathbb R$ be Riemann integrable and $f>0$. Prove that $\int_a^bf>0$. (Without Measure theory)If $L(f, P)$ is a lower sum then $$L(f,P) \le \int_a^b f dx.$$ Each lower sum is clearly positive. Jan18 accepted Wedge product of matrices Jan18 accepted If coefficients are algebraic then the roots are algebraic Nov30 comment Real integral by residues@DonAntonio I got it now! Nov30 accepted Real integral by residues Nov30 asked If coefficients are algebraic then the roots are algebraic Nov22 comment Real integral by residuesIt is not exactly L'Hopitals rule! Nov22 asked Real integral by residues Oct30 comment Evaluating a surface integral with differential formsTake the normal to the surface (cylinder). When you walk on the circle (boundary) the surface should be on your left. Oct30 accepted Sum of two consecutive squares which is a cube Oct29 answered Complex periodic exponential Oct29 answered Evaluating a surface integral with differential forms Oct24 asked Sum of two consecutive squares which is a cube Oct12 awarded Editor Oct12 revised Circle in the complex planeadded 119 characters in body Oct12 answered Circle in the complex plane Oct12 asked Wedge product of matrices Oct12 comment how to prove cubic root of 25 is irrationalWe used the FTA which is proved by induction. Oct12 answered how to prove cubic root of 25 is irrational Oct10 awarded Supporter