Community Tip - You can change your system assigned username to something more personal in your community settings. X
See please here http://iopscience.iop.org/0143-0807/36/2/028001/pdf/0143-0807_36_2_028001.pdf
about this fine curve.
Please see section 4.8 of
http://www.people.fas.harvard.edu/~sfinch/csolve/erradd.pdf
