/sci/ - Science & Math

4th dimension is most frequently used as a means to represent time when calculating for time dilation and can be represented as a function of c * t. The 4th spatial dimension is another axis perpendicular to the three that we're used to, and the 5th dimension is just another one. Picture this: a lifeform which has existed exclusively on a 2d plane, it can only see anything that exists along that plane. We are like those lifeforms, but we exist in a 3d environment, thus we can only observe things that exist along our 3d "plane" (even though when in the context of a 4d environment a 3d generalization is known as a hyperplane). It's hard for us to imagine 4d, so just imagine what 3d looks like to the 2d world for now.