In correct mathematical typography, the dx is separated from the integrand by a space. Some authors use an upright d. Inside the ∫ … dx is the expression to be integrated, called the integrand. In this case the integrand is the function f(x). Because there is no domain specified, the integral is called an indefinite integral.
The website ZeroHedge.com enlightens with The Dummies’ Guide to What the Jobs Report Really Means. The dummies report is a smart nine charts by Matthew C. Klein of Bloomberg View.
We have seen many of these charts before, but some are new. All are gorgeous, so much so that they must be seen and manipulated on at least an iPad and at best a computer.
One chart brilliantly shows the grand-canyon-size wage differential between “service” sector jobs and so-called real employment. “Yes, I did medieval history, may I take your order.”
Klein’s trophy chart is Overall Changes in Employment: a rainbow of job angst. It suggests the evaporation of better jobs. The indirect observation is our de-linking and migration toward a part-time America.
Charts are charts. There has been a renaissance of the making of pictures Euclidean.
Far less so, an understanding of how to look at modestly complex combinations of line and color.
Here’s a tip that Klein nails. In basic calculus, there is a line or series sprawled across the Cartesian space. (You remember the y-axis is vertical, the x-axis horizontal.)
Amateurs look and only look at the series, the line. Math people call the series f(x) (said “f of x”). (They also wear white-dusted wigs at home.)
Chart pros look at the line but also consider the area beneath the line, whether colored or not.
This is the integrand of the series.
Klein generates gorgeous integrand. His riot of colorful space describes the total reality of this anxious recovery. When charting, observe the space beneath. It tells a y-times-x story of greater emotion and clarity.
Channel your inner Newton; derive your better part of Leibniz.
Get smarter: Consider the Matthew C. Klein integrand.