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Questions Asked

UsukiDoll:
Group Title
http://math.stackexchange.com/questions/864114/findasolutiontoalinearsystemusingthedoperatorandmethodofeliminatio
 updated one month ago
 53 replies
 2 Medals
Mathematics

UsukiDoll:
Group Title
constant coefficient problem
y'''2y''y'+2y = 0
 updated 3 months ago
 10 replies
 2 Medals
Mathematics

UsukiDoll:
Group Title
separable equation 1/x dx + dy = 0
 updated 3 months ago
 11 replies
 1 Medal
Mathematics

UsukiDoll:
Group Title
dy/dx = x+1 / y separable equation
 updated 3 months ago
 9 replies
 3 Medals
Mathematics

UsukiDoll:
Group Title
another separable equation
xdx+ydy = 0
 updated 3 months ago
 15 replies
 4 Medals
Mathematics

UsukiDoll:
Group Title
separable equation see drawing
 updated 3 months ago
 29 replies
 3 Medals
Mathematics

UsukiDoll:
Group Title
http://math.stackexchange.com/questions/751410/provefinftyainftyrightarrowbinftyisabijection
 updated 3 months ago
 50 replies
 No Medals Yet
Mathematics

UsukiDoll:
Group Title
http://math.stackexchange.com/questions/776815/letaabcfgibbfhandcaklmshowthatbackslashis
 updated 3 months ago
 2 replies
 No Medals Yet
Mathematics

UsukiDoll:
Group Title
Cauchy sequence... I need to prove 03 and 04.
 updated 3 months ago
 55 replies
 No Medals Yet
Mathematics

UsukiDoll:
Group Title
http://math.stackexchange.com/questions/767117/letabinrwhereabprovethatthereexistarationalnumbercand/767138?noredirect=1#767…
 updated 3 months ago
 88 replies
 5 Medals
Mathematics

UsukiDoll:
Group Title
http://math.stackexchange.com/questions/766935/provethatifyzinqthenyzina
 updated 3 months ago
 34 replies
 1 Medal
Mathematics

UsukiDoll:
Group Title
prove that gcd(a,m) = 1 and gcd(b,m) = 1 if and only if gcd(ab,m) = 1
Just If gcd(ab,m) = 1, then gcd(a,m) = 1 and gcd(b,m) = 1 only
 updated 4 months ago
 12 replies
 2 Medals
Mathematics

UsukiDoll:
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@satellite73 need your help figuring this out.... going to type in details in the comments
 updated 4 months ago
 25 replies
 No Medals Yet
Mathematics

UsukiDoll:
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@satellite73 need help with something link in comments
 updated 4 months ago
 45 replies
 No Medals Yet
Mathematics

UsukiDoll:
Group Title
Let \(R\) be a reflexive and transitive relation on a set \(S\). Let \(R^*\) be the dual relation, \((a,b) \in R^*\) if and only if \((b,a) …
 updated 4 months ago
 62 replies
 No Medals Yet
Mathematics

UsukiDoll:
Group Title
Question: A number is said to be algebraic if it is the root (zero) of a polynomial with integer coefficients. Show that the set of algebrai…
 updated 4 months ago
 87 replies
 3 Medals
Mathematics

UsukiDoll:
Group Title
Define a product of pairs setting \((a,b) \cdot (c,d) = (ac+bd,ad+bc)\) . Show that this operation is well defined for equivalence classes.
 updated 4 months ago
 50 replies
 No Medals Yet
Mathematics

UsukiDoll:
Group Title
Refine the relation on a strict poset that is not maximal
…
 updated 5 months ago
 13 replies
 1 Medal
Mathematics

UsukiDoll:
Group Title
I need to create a poset and subset diagram for S_2 [1 2 3 5 6 7 10 14 15 21 30 35 42 70 105 210]. I've tried starting from the middle and …
 updated 5 months ago
 123 replies
 1 Medal
Mathematics

UsukiDoll:
Group Title
what is wrong with this proof?
 updated 5 months ago
 8 replies
 1 Medal
Mathematics

UsukiDoll:
Group Title
Find the least positive integer with remainders 1, 2, and 3 when divided by 7, 8, and 9 respectively.
 updated 5 months ago
 113 replies
 No Medals Yet
Mathematics

UsukiDoll:
Group Title
prove by induction
 updated 5 months ago
 62 replies
 3 Medals
Mathematics

UsukiDoll:
Group Title
Suppose the function \(f \rightarrow X \rightarrow Y\) is onto. Prove or disprove that the induced map \(\bar f^{1} \mathcal P \left({Y}\…
 updated 5 months ago
 32 replies
 2 Medals
Mathematics

UsukiDoll:
Group Title
Define the relation ~ on \(Z \times (Z \backslash {0})\) by \((a,b)~(c,d) \leftrightarrow ad=bc\). Prove that ~ is an equivalence relation. …
 updated 5 months ago
 49 replies
 No Medals Yet
Mathematics

UsukiDoll:
Group Title
Let \(R_1\) and \(R_2\) be equivalence relations on a set \(S\). Prove that \(R_1\) refines \(R_2\) if and only if the partition with respec…
 updated 5 months ago
 61 replies
 1 Medal
Mathematics

UsukiDoll:
Group Title
@satellite73 got a question will post in a minute...
 updated 5 months ago
 103 replies
 1 Medal
Mathematics

UsukiDoll:
Group Title
@satellite got a question will post the attempts in a minute
 updated 5 months ago
 6 replies
 3 Medals
Mathematics

UsukiDoll:
Group Title
Prove that \(f: X \rightarrow Y\) is an injection if and only if the equation \(\bar f^{1}(\bar f)(A)=A\) holds that for all \(A \in P(X)\)…
 updated 6 months ago
 9 replies
 No Medals Yet
Mathematics

UsukiDoll:
Group Title
Let \(S \subseteq R\) and let \(f\) and \(g\) be functions from \(S\) into \(S\). Suppose that \(f\) is increasing on \(S\) and \(g\) is dec…
 updated 6 months ago
 85 replies
 1 Medal
Mathematics

UsukiDoll:
Group Title
Let \(f: X \rightarrow Y, g: Y \rightarrow Z\) and \(h: Z \rightarrow U\). Prove that for all \(T \in P(U), \bar( h \circ g \circ f)^{1}(T)…
 updated 6 months ago
 102 replies
 1 Medal
Mathematics
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