a little bit suffering

This weeks classes are about quantifiers, sentences, symbols and implications. All of those things come into my mind in a week which makes me feel a little bit confused. I think I need to organize them in this weekend. Quantifiers and sentences do not mess me up, but implication does.

Symbols are the easiest one for me, thanks for MAT223!!!  In this semester Mat224 also include symbols. But there is a new one the symbol of negation, if I understand correct this symbol means non or not.

I want to say something about implication. In English, the definition of implication is "if...then".  In other words, implication means giving a qualification and then geting a result. The following sentence is an example: " if today is raining, then you will need to bring an umbrella.  But I am not very clear about the contrapositive and converse.The original implication is "if x, then y". In my opinion, the contrapositive for that is " if non-y, then non-x".  Also I think in contrapositive, if the original implication is True, then the contrapositive of that implication is True.The definition of converse in logic is the same as its English meaning . Also in my opinion, the original implication is 'if x, then y' and this is True. The converse of that implication is 'if y, then x' but we cannot figure out whether this is True or False. For example, in calculus, my high school teacher said if a function is differentiable on it domain, then it is continuous on its domain, but if a function is continuous on its domain, we don't know that is differentiable on its domain and the counter example is y = abs (x). I hope my understanding is right. 

Finally, I want to thanks for the tutorial problem set, because that helps me understanding the Venn diagram. It's really helpful.  

The beginning

This is the first week, before I went to this course. I had two questions about this course. The first one is why students in computer science should take this course, and the other one is what this course about?

There is a question in PPT said : " Why CSC 165? ". Also there some sub question below the main question. I do have those questions, especially the one " have trouble understanding world problem".  I always have this problem, to be honest, the most of the marks that I loose in all of my tests is because of I did not really understand the problem and miss some details. So when I saw this question, I feel a little bit nervous. But the good side is if this course can help me deal with that. I will loose less mark in the future.

But what's this course about? The problem is still in my mind. There were some ambiguity sentences on the PPT. That's challenged me because for me English is not my mother tone. So I do have problem understand every word and it's multiple meaning. That's the biggest problem for me, I really hope there will be no ambiguity words problem in the future, if it will be, I may needs to read more English novels or choose one of the linguistics class, even I do not like that course.

Then I want to talk about comment, this the new things that I learned from last semester. Actually, that's one of the part I did not that bad. Because I can use comment to show others what I want to do in this code.

By the way, I thought I did a good decision in last semester which is I select MAT223, Linear Algebra. Because that course include some prove question, although I feel tough. But I learned many math notations. I think it will be useful in this course.

My favorite part of this course is logical. I love logical problems. There are amazing!!!! Because to solve a logical problem, there is like many ways to the answer, but there are some cues to find the right way. I hope the logical problems in this course will let me feel interesting.