Does anyone know a good resource (preferably pictures) that illustrates a conventional way to write the special sets symbols, i.e. In the first post of the thread "cardinal number subtraction", cardinal number subtraction there is a symbol for some kind of set which looks like this: $\\bbb p$ i am familiar.
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Young authors (and some older ones) seem to prefer blackboard bold to plain bold for the standard number systems (and/or they pick it up by osmosis on web sites such as this.
