windsylph
Name:
Mark Poscablo
School:
About:
Saved not by works, but by grace through faith in Christ Jesus.
http://goodpersontest.com
--
I'm that person you see prancing around, just because power walking won't cut it.
.
..
...
Haha, just kidding. I power walk. Around the grounds of Wesleyan Academy. Straight through Village East Ave. Passing by Gateway. Who knows, maybe I'd even end up at 12525 Jones Rd.
Oh, how in the world..
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Questions Answered
windsylph:
Group Title
Prove that the sum of n harmonic numbers H_1 + H_2 + ... + H_n = (n+1)H_n - n
updated 2 years ago
26 replies
2 Medals
Mathematics
windsylph:
Group Title
Discrete Math: Union from i = 1 to infinity of A_i where A_i = (0,i), that is, the set of real numbers x such that 0 < x < i? I answered {x …
updated 2 years ago
3 replies
3 Medals
Mathematics
windsylph:
Group Title
Logic/Discrete Math: Let x be a tool, and P(x) be the statement "an x is in excellent condition". How do you express "No tool is in excellen…
updated 2 years ago
6 replies
1 Medal
Mathematics
windsylph:
Group Title
Discrete Math: Determine whether the statement "for all x, P(x) is true if and only if Q(x) is true" and the statement "for all x, P(x) is t…
updated 2 years ago
4 replies
2 Medals
Mathematics
windsylph:
Group Title
ODE's/Elec Eng'g: The circuit elements in a strictly parallel RLC circuit are R = 312.5 Ohms, L = 50 mH, and C = 200 nF. The initial inducto…
updated 2 years ago
3 replies
No Medals Yet
Mathematics
windsylph:
Group Title
2nd Order Elec Circuits: For a strictly parallel RLC circuit with parameters R, L=275mH, and C=10nF, find the value of R that will yield a d…
updated 2 years ago
2 replies
2 Medals
Mathematics
windsylph:
Group Title
ODE's/Electrical Eng'g: Find v(t) for the RLC circuit in this picture: http://dl.dropbox.com/u/17638088/rlc%20overdamped.PNG given v(0+) = 1…
updated 2 years ago
10 replies
1 Medal
Mathematics
windsylph:
Group Title
How many bit strings of length 12 contain
a) exactly three 1s?
b) at most three 1s?
…
updated 2 years ago
13 replies
2 Medals
Mathematics
windsylph:
Group Title
How many numbers must be selected from the set
{1, 3, 5, 7, 9, 11, 13, 15} to guarantee that at least one pair
of these numbers add up to …
updated 2 years ago
2 replies
1 Medal
Mathematics
windsylph:
Group Title
How many strings of eight uppercase English letters are there that start with X, if no letter can be repeated?
updated 2 years ago
8 replies
1 Medal
Mathematics
windsylph:
Group Title
Prove the attached problem (in the first comment) by mathematical induction (don't use strong).
updated 2 years ago
1 reply
No Medals Yet
Mathematics
windsylph:
Group Title
K-Maps: Please check if these K-Maps are simplified enough?
updated 2 years ago
1 reply
No Medals Yet
Mathematics
windsylph:
Group Title
Limit of |n^3|/|n^2 + nlog n| as n->infinity?
updated 2 years ago
6 replies
1 Medal
Mathematics
windsylph:
Group Title
If a function f1 is less than or equal a function g1, and a function f2 is less than or equal g2, does it follow automatically that f1f2 is …
updated 2 years ago
15 replies
1 Medal
Mathematics
windsylph:
Group Title
Discrete Math: Let f1, f2, g1, g2 be functions from the set N of natural numbers such that g1(n) > 0 and g2(n) > 0 hold for all n > 0. Let f…
updated 2 years ago
3 replies
No Medals Yet
Mathematics
windsylph:
Group Title
Discrete Math: Let f1, f2, g1, g2 be functions from the set N of natural numbers such that g1(n) > 0 and g2(n) > 0 hold for all n > 0. Let f…
updated 2 years ago
2 replies
No Medals Yet
Mathematics
windsylph:
Group Title
Linear Algebra: For what values of a (if any) is the matrix {{1,0,0},{1,a,0},{1,0,3}} defective? Explain your answer.
updated 2 years ago
5 replies
No Medals Yet
Mathematics
windsylph:
Group Title
PDE's: For the partial differential equation u_tt = 9u_xx, a general solution is u(x,t) = F(x+3t)+G(x-3t). Find a particular solution with i…
updated 2 years ago
12 replies
1 Medal
Mathematics
windsylph:
Group Title
Is it true that if F and G are arbitrary differentiable functions, and if F(x)+G(x)=0, then F'(x)+G'(x)=0?
updated 2 years ago
7 replies
3 Medals
Mathematics
windsylph:
Group Title
PDE's: Solve the following PDE using separation of variables: 3u_x + 2u_y = 0, u(x,0) = 4e^(-x).
updated 2 years ago
27 replies
2 Medals
Mathematics
windsylph:
Group Title
PDE's: Show that v(x,y) = xF(2x+y) is a general solution of xv_x - 2xv_y = v, where F is an arbitrary differentiable function.
updated 2 years ago
10 replies
1 Medal
Mathematics
windsylph:
Group Title
PDE's: A string has its ends fixed at x=0 and x=L. It is displaced a distance h at its midpoint and then released. Formulate a boundary val…
updated 2 years ago
3 replies
1 Medal
Mathematics
windsylph:
Group Title
: PDE's: / : Waves: A string has its ends fixed at x=0 and x=L. It is displaced a distance h at its midpoint and then released. Formulate a…
updated 2 years ago
3 replies
No Medals Yet
Mathematics
windsylph:
Group Title
: Linear Algebra: Let t be a fixed real number and let c = cos t, s = sin t, vector x = (c, cs, cs^2, ..., cs^(n-1), s^n)^T. Show that the v…
updated 2 years ago
1 reply
No Medals Yet
Mathematics
windsylph:
Group Title
: Linear Algebra: Describe the intersection of the two hyperplanes x1 + 2x2 - x3 + x4 = 8 and -x1 + 3x2 + x3 - x4 = 2.
updated 2 years ago
13 replies
No Medals Yet
Mathematics
windsylph:
Group Title
, : What is the size of a file if it takes 10 ms to download over 1000 km on a 1 Mbps link? Assume speed of light is 2x108 m/s?
updated 2 years ago
2 replies
1 Medal
Mathematics
windsylph:
Group Title
: : Boolean Algebra: Let A' be NOT A. Is (AB)' the same as A'B'?
updated 2 years ago
3 replies
1 Medal
Mathematics
windsylph:
Group Title
: Boolean Algebra: How is (Bnot) + (Anot)B equivalent to Bnot + Anot and A(Bnot) + Anot? (Anot is "not A", + is "or" and AB is "A and B")
updated 2 years ago
5 replies
No Medals Yet
Mathematics
windsylph:
Group Title
: Calculus/Linear Algebra: Find the point on the plane x+y-z=4 which is closest to the point (2,1,0).
updated 2 years ago
8 replies
No Medals Yet
Mathematics
windsylph:
Group Title
: Linear Algebra: (Diagonalization) Let A = {{1,1},{0,1}}. Use the definition of the matrix exponential to compute e^A.
updated 2 years ago
13 replies
2 Medals
Mathematics
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