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19h
comment Expressing a function in terms of compositions of three functions.
Are there any restrictions on the form of $f,g,h$? Otherwise the task does not make much sense, as one can take $h = F$, $g(x) = f(x) = x$ for example ...
21h
answered Find all numbers that have 30 factors and have 30 as one of their factors.
21h
comment If a sequence of self-adjoint linear operators is convergent, show that its limit is self-adjoint.
Convergent in what sense?
22h
comment Efficient Test For Commuting Matrices
... and $n^3$ can be approved: Using Strassen multiplication, we have $O(n^{2.8\cdots})$
23h
comment How to solve this combinations with repetitions problem using generating functions?
Added somehing @idandi
23h
revised How to solve this combinations with repetitions problem using generating functions?
added 108 characters in body
1d
answered How to solve this combinations with repetitions problem using generating functions?
1d
comment How to solve this combinations with repetitions problem using generating functions?
Not the explanations! The lines starting with '%...' in the source!
Jul
3
answered How to manually determine big number congruences
Jul
2
reviewed Edit Relation between dot product and magnitude of vector product
Jul
2
revised Relation between dot product and magnitude of vector product
edit formatting and written text
Jul
2
answered Proving that $V = U_1 \oplus U_2 \oplus \ldots \oplus U_k$.
Jul
2
answered $f: [0,1] \to \mathbb R$ is continuous and $\int_0^x f(t) dt = \int_x^1 f(t)dt$ for all $x \in [0,1]$, then $f(x) = 0$ for all $x \in [0,1]$.
Jul
2
answered Find the missing dollar
Jun
30
reviewed Approve Determine the roots of equation if possible
Jun
26
comment Hilbert space and uncountable cardinal
You should ask this as a seperate question, but the answer is yes. Consider $$ \mathbf K^{(\kappa)} := \left\{ x \colon \kappa \to \mathbf K \biggm| x^{-1}[\mathbf K \setminus \{0\}] \text{ is finite} \right\} $$ this space has $e^i$, $i \in \kappa$ (defined as above) as basis.
Jun
26
answered Hilbert space and uncountable cardinal
Jun
26
answered Method for finding intersection between two basis
Jun
25
awarded  Good Answer
Jun
24
answered Why does the matrix product of jacobian of coordinate transformation and jacobin of reverse coordinate transformation equals the identity matrix