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Expert Profile: Abe Mantell

Expertise:  Hello, I am a college professor of mathematics and regularly teach all levels from elementary mathematics through differential equations, and would be happy to assist anyone with such questions!

Experience in the area
Over 15 years teaching at the college level.

Organizations
NCTM, NYSMATYC, AMATYC, MAA, NYSUT, AFT.

Education/Credentials
B.S. in Mathematics from Rensselaer Polytechnic Institute
M.S. (and A.B.D.) in Applied Mathematics from SUNY @ Stony Brook

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Average Ratings
Prestige Points: 14270
Knowledge   9.75   Best of the best
Clarity of Response   9.89   Best of the best
Timeliness   9.93   Best of the best
Politeness   9.96   Best of the best
Number Of Questions
(in Past 24 Hours)		0
Max Questions to be Asked
(in 24 Hour period)		1
Total Questions
(since joining AllExperts)		123
Recent Reviews from Users
KnowlClarityTimePolitenessDate
1010101007/23/08
1010101007/10/08
9 10109 05/25/08
1010101001/16/08
1010101001/11/08
User Comments
Thanks for your answer.
(Ambika on 07/23/08)
I feel dumb. For some reason I forgot to exponentiate. The course is a post-graduate Modeling class. Thanks, Abe.
(Cheryl on 07/10/08)
thanks a lot u have been great help
(alok_talk on 05/25/08)
Thanks for the help if its any in trest to you i came up with x^3dy/dx 2x^2y=5 p(x)=x^2 x^2*y=5x^2 x^2*y=5/3x^3 c y=5/3x^3-x^2 c y=5/3x 1
(anthony on 01/16/08)
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Recent Answers from Abe Mantell
2008-09-02  differential equations:  I gather the ax & bx are denominators... Let's first multiply by the LCD, which is a*b*x...so we get: b-abx+a-abx=abx(a-b) ==> b-a-2abx=abx(a-b) ==> b-a=abx(a-b)+2abx ==> b-a=x[ab(a-b)+2ab] ==> x=(b-a)/[ab(a-b)+2ab]...
2008-07-22  Need help in differential equation:  Hello Ambika, First solve the corresponding homogeneous DE: x'''-x'=0 Let x(t)=e^(rt) ==> x'=r*e^(rt), x''=r^2*e^(rt), x'''=r^3*e^(rt) Substituting into the Homogeneous DE, gives: r^3*e^(rt)-r*e^(rt)=0...
2008-07-21  Simultaneous differential equations:  Hello Macarena, I just want to check... (dx/x^2)+y^2 = dy/2xy = dz/(x+y)^3 *z Is (dx/x^2)+y^2 correct? Should it be dx/(x^2 +y^2)??? and dy/2xy is dy/(2xy)??? and dz/(x+y)^3 *z is the "z" in the...
2008-07-13  families of curves:  Hello Joanne, I am a bit confused by your question. Question #1 has nothing to do with a "differential equation" and I do not understand what you mean by "put the the limits on the equation to make...
2008-07-10  popuation problem:  Hello Cheryl, Remember to include a constant of integration...so you should have obtained: ln P = [(at^2)/2]+ bt + C Solving for P: P(t)=e^[(at^2)/2 + bt + C] = P(t)=e^[(at^2)/2 + bt]*e^C, but e^C...
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