# Questions tagged [reference-request]

This tag is used if a reference is needed in a paper or textbook on a specific result.

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### Are dark numbers known? [closed]

The limit in analysis is approximated better and better by a sequence or series. Contrary to set theory. Bertrand Russell wrote: "But nowadays the limit is defined quite differently, and the ...
1 vote
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• 41
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### Is a Lie subgroup whose center is closed, a closed subgroup itself?

I want to show that a certain Lie subgroup (i.e. generated by the exponential of elements in some Lie subalgebra) of a Lie group is closed. My knowledge of the subject of Lie groups is rudimentary, ...
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### How to learn homotopy theory

I studied some basic algebraic topology (homotopy/homology/cohomology groups). When reading about the Dold-Thom theorem, the fancier and more recent sources sooner or later all started to use homotopy ...
• 153
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### Only finitely many rational curves in a complete linear system of a K3 surface

Consider a projective complex K3 surface $X$, then $\lvert D\rvert$ contains only finitely many rational curves for any divisor $D$ on $X$. What is the original reference for this result? 124 views

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### What is `the ideal set theory' [closed]

This Q hardly has much sense but anyway, is there anything called the ideal set theory known? Most assuredly this should have nothing to do with ideals (like the Frechet ideal etc.).
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• 2,629
1 vote
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### Multiple Wiener integral as Witt polynomial of Brownian motion

I know that if i have a Brownian motion $W_t$ the multiple Wiener integral $\int_0^t \int_0^{\xi_1}...\int_0^{\xi_n} dW_{\xi_1}...dW_{\xi_n}$ can be expressed as $H_n(\int_0^t dW_s)$ where $H_n$ is ...
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• 265
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### The minimal surface operator in a Riemannian metric

Let $\Omega \subset \mathbf{R}^n$ be a domain, and let the cylinder $\Omega \times \mathbf{R}$ above it be endowed with a Riemannian metric $g$. (Note this is not assumed invariant in the vertical ...
• 4,124
1 vote
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### A question about the square root error of one dimensional random walks

Consider a one dimensional random walk, in which the probability of moving left along a line is $q=1/2$ and the probability of moving right is $p=1/2$. The square root error $\langle d_N \rangle$, ...
• 918
1 vote
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### Name for the cell poset of the staircase partition

Is there a standard name for the cell poset of the staircase partition $(n,n-1,\dots,1)$, where, in English notation, a cell covers the adjacent cell in the row above and in the column to the right? ...
• 5,193
1 vote
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### A variation of domino tiling problem with fusions

I know several specific variations of the domino tiling problem has been determined to be decidable or undecidable, such as the seed domino problem. I have a variation which I have not been able to ...
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### Comparing spectral radius of two graphs using the entry of Perron vector

Suppose we have a graph $G$. Let $A$ be the adjacency matrix of $G$ and $x$ be the corresponding Perron vector. Let $x = (x_1,x_2,\cdots,x_n)^t$, where $x_i$ corresponds to the vertex $i \in V(G)$. We ...
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