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Ight, after thinking about it and dming it with kingslayer, I came to this. Plz confirm this if you can. So basiclly, an X axis contains a one-dimensiniaol structure by plotting a line segment on the said graph and creating one coordinate creating the point [0,1] which represents all the points between 0 and 1. Now you can create a square by taking copies of this line segment and lining them up perpendicularly on the Y-axis. If we take copies for every point on another line segment (let's say [0,1] again), we get a 2D square, represented as [0,1]×[0,1]. The reason you use an uncountably infinite set is that every point on the second interval (the y-axis) can host a copy of the first interval (the x-axis). If we only had a countably infinite set (like integers), we would miss points on the line, and we wouldn't be able to cover the entire 2-D square.The cardinality of the set of real numbers is uncountably infinite. Take time, for instance. Time is non-discrete and continuous, which means it consists of not just many seconds/days/years, but every infinitesimal interval in between. So you're not just counting 1, 2, 3, but 1, 1.01, 1.001 onwards. This is why a space-time continuum is qualitatively superior to a universe. Adding a time axis over a given universe is like assigning a cosmos with a state of existence over every time interval. This would make a space-time continuum equivalent to uncountably infinite snapshots of a universal space, and a higher temporal dimension equivalent to uncountably infinite snapshots of a whole space-time.