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Mar
13
comment Find the size of the area (triangle in a trapezoid)
Maybe $M$ as in "midpoint"?
Mar
13
answered Prove trees has a leaf in set of vertices coloured black, or set of vertices coloured white
Mar
13
comment Prove trees has a leaf in set of vertices coloured black, or set of vertices coloured white
According to the song, all the leaves are brown.
Mar
13
comment question on prime number
For $a$ not a square, the answer is known. By everyone. Unfortunately, there isn't anyone who can prove it.
Mar
13
comment Constructing a 3-regular graph with no 3-cycles
You have $2n$ vertices numbered $1,2,\dots,n$ --- do you mean $1,2,\dots,2n$?
Mar
13
revised Find a formula that generates the following sequence
formatting for readability
Mar
13
comment Arbitrary ratio sequences on a partition of $\mathbb{R}$ (Partition regularity of fixed ratio sequences)
You might be interested in Hindman, Neil; Leader, Imre; Strauss, Dona; Open problems in partition regularity, Special issue on Ramsey theory, Combin. Probab. Comput. 12 (2003), no. 5-6, 571–583, MR2037071 (2005e:05147)
Mar
13
comment Arbitrary ratio sequences on a partition of $\mathbb{R}$ (Partition regularity of fixed ratio sequences)
I'd say it fits into Ramsey Theory. I know I've seen similar questions about the integers; given $n$ and some system of linear equations, is it true that in any partition of the integers one part will contain a solution to the system. I think there were papers by Neil Hindman.
Mar
13
comment Find a formula that generates the following sequence
@Don, the answer to "find a formula that generates the following sequence".
Mar
13
answered Find a formula that generates the following sequence
Mar
13
comment For what values of a is this vector in the span
Oh, "triples of real numbers" just means things like $(\sqrt2,\pi,-49.873)$.
Mar
13
comment For what values of a is this vector in the span
Do those operations actually give a vector space? Don't remember seeing anything like that before.
Mar
13
comment Simplifying $3^2 + (-8\div2)$
ScienceTechnologyEngineeringMathematics, I think.
Mar
12
comment System of equations wrt self-adjoint operators
Nice to know that it is possible to work through my hints and get to the answer!
Mar
12
comment Solving for vector in linear algebra
First, that's a new question, not a comment on an answer to an existing question. Second, it may be a question better suited for the programming site than this math site.
Mar
12
revised Prove that $-\frac{\sqrt{x}}{1+x}\log{x} \leq \log{2}$ for $0 < x < 1$
edited tags
Mar
12
comment Simplifying $3^2 + (-8\div2)$
@Tanner, that would be very sad, if true.
Mar
12
comment Simplifying $3^2 + (-8\div2)$
You are being asked to divide $-8$ by $2$, not into $2$.
Mar
12
revised Simplifying $3^2 + (-8\div2)$
edited tags
Mar
12
comment Approximating a sequence with funny recurrence
For what it's worth, the number of fixed points in all involutions on an $n$-set is tabulated at oeis.org/A013989 along with a recursion and some other information. The number of involutions is tabulated at oeis.org/A000085 (and of course your sequence is the termwise quotient of these two sequences).