I was asked by an editor (someone I know very well, actually a former postdoctoral advisor of mine), to referee a paper for a math journal.
The journal is new. It only started receiving submissions a few months ago, and no paper was published in it yet.
How do I know what standards to apply? All I got in the instructions from the editor is the usual generic stuff all MSP journals write: "We would like you to consider acceptance only if, in your opinion, the article contains substantial and interesting new results. The number of submissions to the (---) continues to increase and we would like to publish only articles of very high quality."
Should I ask the editor for examples of established journals whose level they aim for?