solution for homework from 5.1 to 5.4.

Be cautious that the problem number is assigned as Thomas`s book.
(Because there is no solution for chap 5 of our book.)
In some case you might need the problem among solution.

In pdf file,
solutions according to 5.1
     "            "        to 5.4
     "            "        to 5.2
     "            "        to 5.3

And there is no solution for #42 in 5.3.