Summary

DescriptionReciprocal integral.svg	English: A plot giving some geometric intuition for why the integral of 1/x is ln n, based roughly on an explanation from "Why is the integral of 1/x equal to the natural logarithm of x?". The integral from 1 to 2 is equal to the integral from 2 to 4 and the integral from 4 to 8. Each region is similar to the last except that it has been scaled vertically to 50% its previous height, and scaled horizontally to 200% its previous width. Extending this, the integral from 1 to 2k is k times the integral 1 to 2, just as ln 2k = k ln 2. Source used to generate this chart is shown below.
Date	22 March 2013
Source	Own work  This W3C-unspecified diagram was created with Mathematica. Category:Unspec SVG created with Mathematica#00080623Reciprocal%20integral.svg
Author	User:Dcoetzee

Licensing

I, the copyright holder of this work, hereby publish it under the following license:

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The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission. http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse

Category:CC-Zero#Reciprocal%20integral.svgCategory:Self-published work

Source

All source released under CC0 waiver.

Mathematica source to generate graph (which was then saved as SVG from Mathematica):

Plot[][{{1/x, 1 < x < 2}}],
  Piecewise[{{1/x, 2 < x < 4}}],
  Piecewise[{{1/x, 4 < x < 8}}]},
 {x, 0, 8.5}, PlotRange -> {0, 2.1},
 Filling -> {{2 -> Axis}, {3 -> Axis}, {4 -> Axis}},
 LabelStyle -> {FontSize -> 14},
 AspectRatio -> 0.9,
 Ticks -> {Table[i, {i, 0, 8}], Table[i*0.3, {i, 0, 8}]}]

Axis fonts were converted to Liberation Serif in Inkscape, and the graphic above the plot was added in Inkscape.