Regarding my recent blog titled: "FFT Interpolation Based on FFT Samples: A Detective Story With a Surprise Ending", eagle-eye DerekB detecting a missing minus sign in one of my algebraic derivations.  If you downloaded, before May 1, 2018, the PDF file for that blog at:

https://www.dsprelated.com/showarticle/1156.php

I recommend you return to that blog and re-download the corrected PDF file. I really do beg your pardon!

Rick,

Thanks.  This is an occupational hazard of being an engineer.  Another hazard is getting something to work, but having the wrong explanation of why it works (which is always the case if you drill down far enough!)

regards,

Neil