I just dont know what Is 4D space and i can’t imagine it…
In: 5
Say I invite you over for lunch and I give you my address like this: “I live at the corner of 6th street and 37th avenue, on the ninth floor, four units from the elevator.” So you write down (6, 37, 9, 4). These four numbers describe my location in space. This is technically still three-dimensional space, so I could give you this information with three numbers- my latitude, my longitude, and my altitude, but street numbers are quantized so we need the extra dimension to be more specific.
Four-dimensional space is a mathematical abstraction for people to do math in. It’s not important to be able to visualize all four dimensions. In 4D space, if you want to describe the location of a point you need to make a list of four numbers, like you did up there.
But dimensions don’t have to be spatial; they can be symbolic. Imagine a society where the only things you can eat for lunch are gyros, ice cream sandwiches, and Diet Pepsi™. Any possible lunch can be described with the number of gyros, ice cream sandwiches, and Diet Pepsi™ you ate, so every point in “lunch space” describes a unique lunch. Then, if lunch scientists figure out that you can also have an apple for lunch, then you would need an extra fourth dimension to describe every unique lunch.
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