4D is also an important idea in physics, developed in the 20th century. In physics, it refers to the idea of time as a fourth dimension, added to the (3D) spatial dimensions. Albert Einstein developed the idea of spacetime by connecting space and time together.
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Four-dimensional space
Four-dimensional space is the mathematical extension of the concept of three-dimensional space. Three-dimensional space is the simplest possible abstraction of the observation that one needs only three numbers, called dimensions, to describe the... Wikipedia
Time is the fourth dimension. So to know where you are, you have to know what time it is.
Jul 21, 2019 · The fourth dimension is the next logical step: it is the three-dimensional space stacked next to itself to add a fourth direction. If you want ...