Example 21.15 ended with a triangle in place of the usual QED square. What does the triangle mean?
Determining whether or not something is an equivalence relation seems to be the kind of thing that you just have to practice over and over until it becomes intuitive. It also seems like a powerful tool that we will make use of later, though it seems fairly arbitrary/pointless in a lot of the current examples. I'm excited to see where it will go! I feel like it is used in something I have seen before, but I can't place what it is...
My impression is that we use these blog posts to communicate to you what material we are familiar with (have I seen the content before?) and/or if we don't understand all or part of the content of the section. I'd imagine they also help you check who is actually doing the reading. Am I correct in this assumption? I don't mind doing the posts. I merely ask because I am not entirely certain that the content of my posts is actually fulfilling the purpose behind them. Are these posts the sort of thing you are looking for?
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