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### Topics - Jiacheng Ge

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##### MAT244--Lectures & Home Assignments / quiz 5 0701
« on: November 06, 2018, 10:07:24 PM »
Can anyone explain the integral here? I tried by parts but don't know how.

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##### MAT244--Lectures & Home Assignments / section 4.4
« on: November 01, 2018, 11:43:12 PM »
What's the strategy to choose from using the undetermined coefficient method or variation of parameters method?

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##### MAT244--Lectures & Home Assignments / sketch a graph
« on: November 01, 2018, 11:40:54 PM »
What's the strategy to sketch a graph of the solution in the x1- x2 plane for t>0?

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##### MAT244--Misc / Test 1
« on: October 13, 2018, 10:10:36 PM »
I just want to make sure that as for second order differential equation, we are responsible for the homogeneous differential equation with both constant coefficients and nonconstant coefficients, and nonhomogeneous differential equation with constant coefficient, but not responsible for the nonhomogeneous differential equation with nonconstant coefficients? I have the concern since the last one appears briefly in 3.5 but the textbook says we will look into it in chapter 5.

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##### MAT244--Lectures & Home Assignments / model or not
« on: September 23, 2018, 09:10:08 PM »
Are we responsible for modelling in MAT244? Or we only need to know how to solve the differential equations? Thanks.

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##### MAT244--Lectures & Home Assignments / question about the acid water problem
« on: September 21, 2018, 08:46:35 PM »
Can anyone explain how the equitation is built in the acid water problem in Lec0201? Also, Is the problems shown in class available to us?

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##### MAT244--Lectures & Home Assignments / Substitution in integral
« on: September 10, 2018, 09:49:24 PM »
dt means with respect to t.

dw means with respect to w.

w’(t)dt means take derivative to w with respect to t.

How can we substitute w’(t)dt with dw?

dw is a prepositional phrase but w’(t)dt is a complete action.

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