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The following code gives 2 when it seems to me it should give 3. RegionDimension[ImplicitRegion[z == y, {x, y, z, w}]] Tested on Mathematica 12.1.1 and Mathematica Online 12.2. Is this a bug or am I missing something?
I agree that integer multiples of 100% work better for the reasons you mention. Unfortunately 150 is quite far from 100 and 200, so not really an option to jump to the nearest value (I have a 28" monitor that looks great at 150%, at 200% would be...