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Where base units come from and how they are related to each other? The second, the metre and other base units are useful approximations for describing our universe. What we measure are mere ratios among measured values and base units. The fundamental question is how... It is difficult to accurately describe real circumstances in nature or technology. We can certainly determine general equations, see thermodynamics, with an accuracy of tens of percent. The rest can be fine-tuned ‘by trial and error’ based on estimates, experience,... It would be better to write in the order of randomness, probability and necessity. For at the beginning is randomness of pure chaotic behaviour then the probability of the states or events and at the end necessity od states, forms or events. Such is already a feature... What is an abstraction? There are many definitions of abstract thinking, to distinguish the important, to remark on common features, from being free from unimportant details, etc. But the requirement for abstraction is to be able to distinguish by own perception among... 
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