This article is still a work in progress... but here's the explanation.
While working on a series of articles about matrix mathematics for Decoded Science, I've been crafting images as illustrations.
Regular readers know that I like to establish copyright for such images by publishing them first, in one of my own blogs.
One Writing Tip for Matrix Mathematics
Your best case for online copyright of a picture is that you published that image in a web site that you control. Add a copyright notice in the footer of that site. Or include (c) in the image credit or caption.
Another option is to publish in a site such as Flickr, where you can specify the license rights that suit your needs.
Thanks for reading this preview of my images for a Decoded Science series on matrix mathematics. Again, I apologize that it is incomplete.