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Today, I went to the Kyobo Bookstore.

Sometimes I was perplexed with the fact that I know less then I expected. I've some tendency to overestimate me. I felt it again.

I looked around the corner for English and Math. My conclusion is, I'm not ready to study Differential Equation, and I must study Calculus at first. And I looked over the vocabulary books, especially Word Smart. The words and sentences are too difficult to study for me. So I decided to study Voca 22000 which I already purchased six years ago and never finished.

There's only one choice but to run hard.

Some Books

• Differential Equations - a systems approach
  • Author : Goldberg Potter Very useful exercises, but some difficult for me.
• Differential Equations

  • Author : Lomen & Lovelock Relatively easy and very kind in explanation...

• Calculus - single variable
  • Author : Hughes-Hallett
• Linear Algebra
  • Author : Gareth Williams there also exist the version of Korea (Scitech Media)

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