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### Messages - Victor Ivrii

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1
##### MAT334--Misc / Re: Changing tutorial
« on: Today at 02:19:36 AM »
12-1 there will be lunch break, but it could happen that she is away (attending some meetings) later. On the safe side: come before this.

2
##### MAT244--Lectures & Home Assignments / Re: model or not
« on: September 23, 2018, 09:16:58 PM »
No modeling required.

3
##### MAT334--Lectures & Home Assignments / Re: Section 1.4 Example 8
« on: September 23, 2018, 09:13:50 PM »
Explain, how you use squeeze theorem.

4
##### MAT334--Lectures & Home Assignments / Re: Section 1.2 Question 18
« on: September 23, 2018, 09:11:34 PM »
Consider arguments of two $a,c$

5
##### Quiz-1 / Readme before posting
« on: September 23, 2018, 12:41:16 PM »
Post solutions to Quiz-1 here, not earlier than Friday, September 28, 18:00, only as responses to topics I create.

You may post solutions to one problem only (not necessarily from your TUT section), but then you may discuss solutions to all of them.

No posts after a "perfect solution" (no errors, properly typed) is posted. You may post scans of the solutions  (see  how to scan using smartphone), but not photos. Still typed solutions are preferred.

If somebody posted a solution, do not post another one "I got a different answer!" unless you point to the flaw in the already posted solution.

6
##### MAT334--Lectures & Home Assignments / Re: Hint for Question 20 in Section 1.2
« on: September 23, 2018, 12:28:22 PM »
Select an origin at $z_1$. Describe what you get for

* $t=0$, $t=1$
* $0<t<1$, in particular $t=\frac{1}{2}$
* $t<0$, in particular $t=-1$
* $t>0$, in particular $t=2$

You MathJax for math snippets,

7
##### Quiz-1 / Readme before posting
« on: September 23, 2018, 08:01:40 AM »
Post solutions to Quiz-1 here, not earlier than Friday, September 28, 18:00, only as responses to topics I create.

You may post solutions to one problem only (not necessarily from your TUT section), but then you may discuss solutions to all of them.

No posts after a "perfect solution" (no errors, properly typed) is posted. You may post scans of the solutions  (see  how to scan using smartphone), but not photos. Still typed solutions are preferred.

If somebody posted a solution, do not post another one "I got a different answer!" unless you point to the flaw in the already posted solution.

8
##### MAT244--Lectures & Home Assignments / Re: Describing Direction Fields
« on: September 23, 2018, 03:47:04 AM »
One can write formulae with better (larger) vertical spacing and in more compact form. There are inline formulae (in single dollars) and display formulae (in double dollars, which is the simplest, but  deprecated way).

We will find later that the  behaviour as $t\to \pm \infty$ could be often determined without actually solving equations.

9
##### MAT334--Announcements / Term Test 1 arrangement
« on: September 22, 2018, 02:53:06 PM »
* Please select  Option 1 if you do not have a conflict

* If Option 1 does not work for you (you have a conflict), but Option 2 works, select it

* If both Options 1, 2 do not work for you (you have a conflict), but Option 3 works, select it

* If Options 1, 2, 3 do not work for you (you have a conflict), but Option 4 works, select it

* If none of the Options work, then email me (ivrii@math.toronto.edu) indicating: that none of the above options work and what other options would work: (like 9:00-11:00 morning and so on).

Do not email me if any of the options offered works for you.

Please make Subject of email: MAT334-TT1

10
##### MAT334--Misc / Re: Quiz
« on: September 22, 2018, 02:48:33 PM »
Ende Jin, please read what was posted in the topic before:
I plan to do it during tutorials. Look at http://www.math.toronto.edu/courses/mat334h1/20189/homeassignments-334.html and you'll see that at each quiz there is a black triangle which says where the quiz will be. However, everything beyond current week is not rock solid. Week 3 will be finalized (and problems appear) during coming weekends (probably at Saturday morning) and so on.

11
##### MAT244--Lectures & Home Assignments / Re: Different methods
« on: September 22, 2018, 02:45:10 PM »
During the exam or the quiz, do we have any hints for the method to solve questions? Like setting $Y = uy$
Sometimes

12
##### MAT244--Announcements / Term Test 1 arrangement
« on: September 22, 2018, 01:17:32 PM »
* Please select  Option 1 if you do not have a conflict

* If Option 1 does not work for you (you have a conflict), but Option 2 works, select it

* If both Options 1, 2 do not work for you (you have a conflict), but Option 3 works, select it

* If Options 1, 2, 3 do not work for you (you have a conflict), but Option 4 works, select it

* If none of the Options work, then email me (ivrii@math.toronto.edu) indicating: that none of the above options work and what other options would work: (like 9:00-11:00 morning and so on).

Do not email me if any of the options offered works for you.

Please make Subject of email: MAT244-TT1

13
##### MAT244--Misc / Re: quiz
« on: September 21, 2018, 09:59:05 PM »
No modelling problems, with this exception each problem in the Home Assignments for Week 1--2 is a fair game

Mengmeng, search and read before asking

14
##### MAT334--Lectures & Home Assignments / Re: Section 1.4 Example 8
« on: September 21, 2018, 09:17:12 AM »
Could you explain more about the trig function vanishing?
" trig function vanishing" is the product of your imagination. Essentially you are told that
$$| \frac{1}{n}\bigl(\cos (\theta)+i\sin(\theta)\bigr| = \frac{1}{n} |\cos (\theta)+i\sin(\theta|= \frac{1}{n}.$$

15
##### MAT244--Lectures & Home Assignments / Re: Sec 2.6 Q14 "Solve for valid solution period"
« on: September 21, 2018, 01:19:08 AM »
We get a quadratic equation with respect to $y$, right? So discriminant must be positive (or, at least, non-negative).

Since it is said "approximate" it means the use of a calculator of some kind

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