:IDuan, that's not difficult Q at all, you just need to try to get free from bondage of [[Kerkut’s student syndrome]] and start thinking logically on your own. Even in [[science]] you can have many contradictory positions called [[hypothesis|hypotheses]] or [[theory|theories]] on the very same subject thus clearly [due to law of non-contradiction stating that something cannot be both true and not true at the same time when dealing with the same context] at least one of them must be "inexact". The possibility of hypothesis or theory to exhibit the property of being inexact is actually the very nature of so called [[falsifiability]] (an inherent possibility to prove it to be false). For example, you may have a group of Big Bangers and group of adherents of steady-state theory. That however does not pose any hindrance to define objects such as [[Quasar|QSOs]] and evaluate candidates against criteria and if met, associate the given object with that defined class. Both theories of which at least one must be inexact then may try to explain the origin of QSOs but it does not affect whatsoever the membership of any object in the QSO class. Anything needed is just to evaluate the object in question against the criteria for QSO membership. I hope this helps.--[[User:AK|AK]] 09:52, 27 December 2013 (EST) | :IDuan, that's not difficult Q at all, you just need to try to get free from bondage of [[Kerkut’s student syndrome]] and start thinking logically on your own. Even in [[science]] you can have many contradictory positions called [[hypothesis|hypotheses]] or [[theory|theories]] on the very same subject thus clearly [due to law of non-contradiction stating that something cannot be both true and not true at the same time when dealing with the same context] at least one of them must be "inexact". The possibility of hypothesis or theory to exhibit the property of being inexact is actually the very nature of so called [[falsifiability]] (an inherent possibility to prove it to be false). For example, you may have a group of Big Bangers and group of adherents of steady-state theory. That however does not pose any hindrance to define objects such as [[Quasar|QSOs]] and evaluate candidates against criteria and if met, associate the given object with that defined class. Both theories of which at least one must be inexact then may try to explain the origin of QSOs but it does not affect whatsoever the membership of any object in the QSO class. Anything needed is just to evaluate the object in question against the criteria for QSO membership. I hope this helps.--[[User:AK|AK]] 09:52, 27 December 2013 (EST) |