A common definition of display/screen/graphic/pixel resolution (as used by MSDN and CompTIA, the textbook on my desk, and a number of archived magazine articles stretching back to the mid 90s) is that display resolution is the total number of pixels on the display expressed as X dimension multiplied by Y dimension. In earlier works I see an asterisk sometimes used between the numbers but now it's usually an x; either way multiplication is inferred, and if 1920x1080 is an equation to give you the total number of pixels, the associative property of multiplication applies just like it would for any other equation. Multiplying the horizontal dimension by two and the vertical dimension by two is the same as multiplying the entire equation (the "resolution") by four.
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At least 3D won't die overnight. The movies do sell fairly well in some markets (which is why almost all my 3D Blu-rays are for Europe and Australasia). Just not in the big American one for... lots of reasons from how poorly 3D was implemented in sets to how costly and difficult it was to acquire the content. But 3D has died multiple times. It will be back. Each time it comes back it's better than before. It may be another 15 or 20 years, but we will get our 3D again, and it'll be glasses-free, multi-perspective, and possibly with multifocal depths.