I'am reading a research paper about graph databases and i stumbled upon a notation that i don't understand .. I was far from academia for a while so help is much appreciated ..
The highlighted part is the one i don't understand .. Also how can i easily lookup these symbols and notations without the need to refer back to somebody ..
Thank You
A less than equals but with the curly lines is used frequently for to show the definiteness of a matrix. Though I don't think that works in this context. Judging from the context of the paper it seems like the symbol is being used for the representation of a binary relation in a partially ordered set.
https://en.wikipedia.org/wiki/Partially_ordered_set
Whenever I don't know a symbol, I use this classifier:
http://detexify.kirelabs.org/classify.html
It gives the answers in terms of LaTeX but that's typically enough for a good starting point.