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November 10th, 2017, 02:13 PM  #1 
Member Joined: Oct 2016 From: Slovenia, Europe Posts: 52 Thanks: 5  Is it possible that Wolfram Mathematica is solving integrals wrongly?
I think this integral calculation in Mathematica is wrong. I am quite sure, that Mathematica works ok, while I do not understand something. Please help me. Graphs (the red one is under the blue and the green): Wolfram Mathematica Symbolab: Last edited by skipjack; November 10th, 2017 at 06:02 PM. 
November 12th, 2017, 02:11 PM  #2 
Senior Member Joined: Feb 2016 From: Australia Posts: 1,407 Thanks: 480 Math Focus: Yet to find out. 
Why do you think it's wrong? It's a decaying exponential.

November 13th, 2017, 03:31 PM  #3 
Math Team Joined: Jan 2015 From: Alabama Posts: 2,821 Thanks: 750 
How many decimal places are you allowing for the answer? $\int_{10.3}^\infty e^{39.1(x 10.3}dx$ $\frac{1}{39.1}\left[e^{39.1(x 10.3)}\right]_{10.3}^\infty$ $\frac{1}{39.1}\left(0 1\right)= \frac{1}{39.1}= 0.02557$ 

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integrals, mathematica, solving, wolfram, wrong, wrongly 
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