Civilizations as finite b-lognormals: Mathematical history
Centuries of human history on Earth should have taught us something. Basically, civilizations are born, fight against each other, and die, merging, however, with newer civilizations. To cast all this in terms of mathematical equations is hard. The reason nobody has done so is because the task is so daunting. Indeed, no course on Mathematical History is taught at any university in the world.
This paper investigates the equivalent thicknesses of 20 non-edge-on spiral galaxies,and some other parameters,such as forbidden radius,pitch angle and arm's inclination.Basced on the logarithm spiral,we obtained those parameters.We compared the new method with the old method,and also analyzed the result.We hoped those parameters were helpful for the future galaxy study.