By Alfred North Whitehead

Alfred North Whitehead (1861-1947) was once a popular English mathematician and thinker who co-authored the hugely influential Principia Mathematica with Bertrand Russell. initially released in 1919, and primary republished in 1925 as this moment variation, An Enquiry about the ideas of ordinary wisdom ranks between Whitehead's most crucial works; forming a point of view on medical remark that included a posh view of expertise, instead of prioritising the location of 'pure' feel facts. along significant other volumes the idea that of Nature (1920) and the main of Relativity (1922), it created a framework for Whitehead's later metaphysical speculations. this can be an enormous booklet that would be of price to an individual with an curiosity within the dating among technological know-how and philosophy.

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A-system, and t/l'be the measure of the lapse of time in the {3-system. The distinction between the two time-systems is embodled in the fact that event-particles which happen simultaneously at tIme to. in a-space do not happen simultaneously throughout space {3. ) in a-space and a-time and at (x~,yp~ Z~. ) in {3-space and (3-time, we seek for the formulae which are to replace equations (1) of the Newtonian theory. As before let OeX0. lie in the direction of the motion of {3 in a, and 0/X/ in the reverse direction of the motion of a in {3.

RO'2 But, as ,ve have seen, this invariance, ,yith these 42 1. THE TRADITIONS OF SCIENCE formulae for transformation, does not extend to Max• well's equations for the electromagnetic field. " It is natural to suppose that this set should be that on~ with respect to which the stagnant ether is at rest. Namely, stating the same fact conversely, the stagnant ether defines this consentient set. There would be no difficulty about this conclusion except for the speculative character of the material ether, and the failure to detect the evidences of the earth's motion through it.

What we mean are physical facts expressible in terms of immediate perceptions; and it is incumbe'i1t on us to produce the perceptions of those facts as tile meanings of our terms. lian formulae in terms of what we will term the 'message' theory, discussed in the next chapter. 47 AI'PENDIX TO CHAPTER III Let a and f3 be two consentient sets of the Newtonian group. ) be the rectangular axis system in the space of a, and (O':XfJ'Y/Z/) be the rectangular axis system in the space of f3. FIrst consider the tradItional theory of relativity.

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