INTRODUCTION
Before I come to the title of this paper, let me begin by shaking the very mathematical foundation of spacetime physics. Unlike real numbers, imaginary numbers cannot be taken as an independent axis. While we had correctly identified that i (square root of -1) represent 90 degree rotation, we failed to realize that if we explicitly use a perpendicular axis (additional dimension), then i must go away. i can stay only as long as we don’t use an additional axis. This is very similar to the argument: Suppose I have taken one thousand dollars from the bank and spent it somewhere. Then I will either say “I am in a debt of 1000 dollars”, or else I should say “I own -1000 dollars”. But I must not say “I am in a debt of -1000 dollars”. The negative sign is automatically telling the direction (since debt is in the opposite direction of owning). Therefore, if negative numbers are used (i.e. along with the minus sign), then we should use the positive x-axis (i.e. in the same direction of positive numbers). If we don’t use the minus sign, then we should use the negative x-axis (in the opposite direction of positive x-axis from the chosen origin). But we should never use both together. Similar argument applies for imaginary i