urbanderivative
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urbanderivative:
Group Title
Define the set E ={ 1/n : n is a natural #} contained in [0,1]. Prove that the function
f(x) = {1, when x exists in E
0, othe…
 updated 7 months ago
 2 replies
 No Medals Yet
Mathematics

urbanderivative:
Group Title
find the subsequential limits for sn = sin(npi/4)
 updated 8 months ago
 2 replies
 No Medals Yet
Mathematics

urbanderivative:
Group Title
Use mathematical induction to show
1/2 + 1/4 + ... 1/(2^n) = 1  1/(2^(n+1))
 updated 8 months ago
 11 replies
 1 Medal
Mathematics

urbanderivative:
Group Title
Ordinary Differential Equations, repeated roots.
 updated 10 months ago
 1 reply
 No Medals Yet
Mathematics

urbanderivative:
Group Title
xy''+y'=4 y(1)=1 y'(1)=8 x>0
find y' and y solutions for the IVP
 updated 10 months ago
 3 replies
 1 Medal
Mathematics

urbanderivative:
Group Title
A radioactive material decays at a rate proportional to the amount present.
Initially there are 100 milligrams of the material present and …
 updated 11 months ago
 12 replies
 1 Medal
Mathematics

urbanderivative:
Group Title
Find the integral ( from 0 to 2): qdq / (8q +5) im trying to use u substitution.
 updated one year ago
 3 replies
 2 Medals
Mathematics

urbanderivative:
Group Title
Size of population P P(t)=500e^(.02t)
explain to me how to do it
 updated one year ago
 6 replies
 No Medals Yet
Mathematics

urbanderivative:
Group Title
Let R be a commutative ring with identity. We will say that an ideal I of R is called "prime" is ab in I implies that either a is in I or b…
 updated one year ago
 16 replies
 1 Medal
Mathematics

urbanderivative:
Group Title
Consider the set S of matrices of the form
\left[\begin{matrix} a & b\\ 0 & c\end{matrix}\right]
with a, b, c real numbers.
…
 updated one year ago
 8 replies
 2 Medals
Mathematics

urbanderivative:
Group Title
let n be an odd integer. Assume that a is an integer such that a=2(modn) show that gcd(a,n) = 1
 updated one year ago
 6 replies
 No Medals Yet
Mathematics

urbanderivative:
Group Title
prove that R* x R is a group under the operation * defined by (a,b) * (c,d) = (ac, bc + d)
 updated one year ago
 61 replies
 4 Medals
Mathematics

urbanderivative:
Group Title
Show that R={( a 0 / b c)}  a,b, c are elements of Z} i a ring with identity.
a 0 / b c is the matrix with a 0 the first row and b c the…
 updated one year ago
 25 replies
 2 Medals
Mathematics

urbanderivative:
Group Title
Suppose I and J are ideals in a ring R and let f: R > R/I X R/J be the function defined by f(a)=(a+I, a+J).
a) Prove that f is a homomor…
 updated one year ago
 7 replies
 1 Medal
Mathematics

urbanderivative:
Group Title
if (m,n) = 1 in Z, prove that (m) intersect with (n) is the ideal (mn)
 updated one year ago
 3 replies
 No Medals Yet
Mathematics

urbanderivative:
Group Title
show that q /(x^22) is not isomorphic to q /(x^23)
 updated one year ago
 52 replies
 2 Medals
Mathematics

urbanderivative:
Group Title
A certain capacitor in a circuit has a capacitive reactance of 36.8 Ω when the frequency is 136 Hz. What capacitive reactance does the capa…
 updated one year ago
 3 replies
 No Medals Yet
Mathematics

urbanderivative:
Group Title
is X^2+7 in C[x] irreducible?
 updated one year ago
 20 replies
 2 Medals
Mathematics

urbanderivative:
Group Title
Let f:R[x] >R be a function that maps each polynomial in R[x] onto its constant term. Show that f is a surjective homomorphism of rings.
 updated one year ago
 2 replies
 1 Medal
Mathematics

urbanderivative:
Group Title
Perform the Indicated operation
(x+1)^3 in Z3[x]
 updated one year ago
 16 replies
 2 Medals
Mathematics

urbanderivative:
Group Title
Which of the following functions re homomorphisms and why?
a. f: Z to Z defined by f(x) = x
b. f: Z2 to Z2 defined by f(x)= x
…
 updated one year ago
 28 replies
 2 Medals
Mathematics

urbanderivative:
Group Title
let R and S be rings with identity. what are the units in the ring R x S
 updated one year ago
 5 replies
 1 Medal
Mathematics

urbanderivative:
Group Title
A number 12 copper wire has a diameter of 2.053 mm. Calculate the resistance of a 31.0 m long piece of such wire.
(Use 1.72×108 Ωm for the…
 updated one year ago
 5 replies
 1 Medal
Mathematics

urbanderivative:
Group Title
prove that if p is prime and ab=0 in Zp then a=0 or b=0
 updated one year ago
 9 replies
 2 Medals
Mathematics

urbanderivative:
Group Title
Two parallel plates, each of area 4.12 cm2, are separated by 5.90 mm. The space between the plates is filled with air. A voltage of 5.05 V i…
 updated one year ago
 2 replies
 No Medals Yet
Mathematics

urbanderivative:
Group Title
prove if 3  (a^2+b^2) then 3  a and 3  b
 updated one year ago
 7 replies
 1 Medal
Mathematics

urbanderivative:
Group Title
If c > 0, prove that (ca,cb) =c(a,b).
…
 updated one year ago
 5 replies
 1 Medal
Mathematics

urbanderivative:
Group Title
consider a tank used in certain hydrodynamic experiments. after one experiment the tank contains 200L of a dye solution concentration of 1g/…
 updated one year ago
 5 replies
 1 Medal
Mathematics

urbanderivative:
Group Title
yy'' + (y')^2 = 0
 updated one year ago
 13 replies
 2 Medals
Mathematics

urbanderivative:
Group Title
If G is a kpartite graph of order n with partite sets of sizes a1, a2,.....an, then
 updated 2 years ago
 1 reply
 No Medals Yet
Mathematics
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