# Christian Blatter

ETH Zurich (Switzerland)

math.ethz.ch/~blatter

Age: 80

 10h answered Help with proving a statement based on riemann sums? 11h answered If $f$ function then $f^{-1}$ function iff $f$ function injective (one-to-one). 13h answered Proving a basis in linear algebra 16h comment I like to know if there is approximated expression of somethingDoing a partial integration I get $$\int_0^x{t^9\over9!}e^{-t}\>dt=-{t^9\over 9!}e^{-t}\biggr|_0^x+\int_0^x{t^8 \over 8!}e^{-t}\>dt\ ,$$ giving a first term $-{x^9\over 9!}e^{-x}$. 16h revised Is there a Mobius (infinite) cylinder?added 134 characters in body 19h answered Is there a Mobius (infinite) cylinder? 20h answered Find area of shaded area in curve with range of values for $y$ 1d answered How to solve $2^x < x^2$ 1d answered How do I transpose an ellipse function to stretch the ellipse into curved space? 1d revised Evaluating $\int_{0}^{3} \sqrt{1+x}\: dx$ using Limit of a Sum approachadded 179 characters in body 1d answered Prove this exp and log inequality? 2d answered Evaluating $\int_{0}^{3} \sqrt{1+x}\: dx$ using Limit of a Sum approach 2d revised Horizontal tangent line of a parametric curveadded 4 characters in body 2d comment Probability with n dice@ByronSchmuland: Thank you for spotting the slip. 2d revised Probability with n dicedeleted 1 character in body 2d revised Water filling problem in Blocks - Algebra Questionadded 32 characters in body 2d answered Probability with n dice 2d answered Horizontal tangent line of a parametric curve 2d comment A piecewise regular simple closed curve bisects the area of the unit sphere if and only if it has total geodesic curvature 0Take a look at the Gauss-Bonnet theorem. 2d answered Having trouble deriving the symbols used in a quadratric approximation problem.