2号要考了，求助逻辑题一道！！！！

yolandekwong

急！！！求助！！GWD逻辑题一道
问：为什么选E  我觉得是C，因为不能用同样的证据（Galileo’s observations ）,那样不就证明了Galileo’s observations of Jupiter’s satellites proved the truth of the Copernican theory是错的了吗？

T-3-Q32.A theory is either true or false. Galileo’s observations of Jupiter’s satellites showed that the Ptolemaic theory of the motion of celestial bodies is false. Therefore, since the Copernican theory of planetary motion is inconsistent with the Ptolemaic account, Galileo’s observations of Jupiter’s satellites proved the truth of the Copernican theory.



The argument above is open to the objection that it makes the questionable assumption that   E

1. Whoever first observed something inconsistent with the truth of the Ptolemaic theory should be credited with having proved that theory false.
   
   
   
2. There are some possible observations that would be inconsistent with the account given by the Copernican theory but consistent with the account given by the Ptolemaic theory.
   
   
   
3. The Ptolemaic and Copernican theories, being inconsistent, cannot both be based on exactly the same evidence
   
   
   
4. Numerous counterexamples were necessary in order to show the Ptolemaic theory to be false
   
   
   
5. The Ptolemaic and Copernican theories, being inconsistent, cannot both be false.
   
   
   

huisang

LZ~这道题问的是假设~不是削弱~文章逻辑就是G的观察证明P是错的，因为C和P是相反的，所以G证明C是对的。这里面的假设就是C和P里肯定要有一个是对的。非此即彼~也就是E的cannot both be false。

demorgan

我也是当削弱做了，我这悲催的英文功底啊~~~