糖宝玩具批发**价钱

    
                                                       花千骨糖宝毛绒玩具

糖宝毛绒玩具批发             糖宝毛绒玩具**价格       糖宝毛绒玩具厂家

【货到付款、厂家直销、全网**】

订购热线：15811042829

微信 QQ :15811042829方经理
 
                  2015新品** 花千骨糖宝

                                   厂家直销产品

      本厂以雄厚的实力、低廉的价格、优良的服务与多家企业建立
了长期的合作关系，拥有一支技术精湛的骨干队伍。拥有自己
的打板师支持看图打版，保证产品质量，价格合理。

欢迎广大客户前来洽谈、指导！
我们期待您的来电咨询订购！
                在线QQ|微信|电话：15811042829

Just so, a fortiori, in mathematics; no more can the geometer hold fast pell-mell all the facts presenting themselves to him; all the more because he it is, almost I had said his caprice, that creates these facts. He constructs a wholly new combination by putting together its elements; nature does not in general give it to him ready made.

Doubtless it sometimes happens that the mathematician undertakes a problem to satisfy a need in physics; that the physicist or engineer asks him to calculate a number for a certain application. Shall it be said that we geometers should limit ourselves to awaiting orders, and, in place of cultivating our science for our own delectation, try only to accommodate ourselves to the wants of our patrons? If mathematics has no other object besides aiding those who study nature, it is from these we should await orders. Is this way of looking at it legitimate? Certainly not; if we had not cultivated the exact sciences for themselves, we should not have created mathematics the instrument, and the day the call came from the physicist we should have been helpless.

Nor do the physicists wait to study a phenomenon until some urgent need of material life has made it a necessity for them; and they are right. If the scientists of the eighteenth century had neglected electricity as being in their eyes only a curiosity without practical interest, we should have had in the twentieth century neither telegraphy, nor electro-chemistry, nor electro-technics. The physicists, compelled to choose, are therefore not guided in their choice solely by utility. How then do they choose between the facts of nature? We have explained it in the preceding chapter: the facts which interest them are those capable of leading to the discovery of a law, and so they are analogous to many other facts which do not seem to us isolated, but closely grouped with others. The isolated fact attracts all eyes, those of the layman as well as of the scientist. But what the genuine physicist alone knows how to see, is the bond which unites many facts whose analogy is profound but hidden. The story of Newton’s apple is probably not true, but it is symbolic; let us speak of it then as if it were true. Well then, we must believe that before Newton plenty of men had seen apples fall; not one knew how to conclude anything therefrom. Facts would be sterile were there not minds capable of choosing among them, discerning those behind which something was hidden, and of recognizing what is hiding, minds which under the crude fact perceive the soul of the fact.
                                              糖宝毛绒玩具批发

 

糖宝毛绒玩具批发         糖宝毛绒玩具价格    糖宝毛绒玩具厂家

【货到付款、厂家直销、全网**】

订购热线：15811042829

微信 QQ :15811042829方经理