2009年2月24日 · You can try to sort topologically, which is O(V + E) where V is the number of vertices, and E is the number of edges. A directed graph is acyclic if and only if this can be done. Recursive Leaf Removal. The recursively remove leaf nodes until there are none left, and if there's more than a single node left you've got a cycle.

2012年1月7日 · Mariano, you seem to be confusing a few things here. A complex is acyclic if and only if it is exact. (see for instance Exercise 1.1.5 in Weibel's Homological Algebra book, or probably anyplace where this is defined). An object is acyclic for a functor if the derived functors of said functor vanish on the object. For instance a flasque sheaf ...

2013年8月3日 · Acyclic data is still reliable for machine control, it is just delivered in a less deterministic way (on the order of milliseconds, sometimes up to several seconds). When accessing a single VFD with a single PLC, you will probably never notice this bursting behavior, and in fact, you may perceive smoother and quicker data transmissions. From ...

2012年5月30日 · Minimum path cover in directed acyclic graph. Ask Question Asked 12 years, 8 months ago.

a little out of my depth here and need to phone a friend. I've got a directed acyclical graph I need to traverse and I'm stumbling into to graph theory for the first time. I've been reading a lot a...

2024年1月27日 · As the title indicates, I have a hard time visualizing cases where the maximum ac. edge set has an exceeding cardinality over a maximal ac. edge set. If someone can provide me with such a case or p...

2019年9月29日 · The acyclic nature means you can safely write contextual processing code that can follow pointers down the edges from a vertex without ever reencountering the same vertex. Visual programming languages like VVVV , Max MSP or Autodesk Maya's node-based interfaces all rely on DAGs.

Therefore, the answer you may be looking for is to use Common Table Expressions and recursive queries. Somes reasons why that is considered a better solution compared to "A Model to Represent Directed Acyclic Graphs (DAG) on SQL Databases" are explained here: Encoding and Querying Graphs in the Relational Model

Flabby sheaves $\mathcal{L}$ are acyclic (Page 381), in the proof it says Let $\mathcal{L}$ be flabby. Since there are enough injectives, there is an exact sequence $0 \rightarrow \mathcal{L} \rightarrow \mathcal{E} \rightarrow \mathcal{Q} \rightarrow 0$ with $\mathcal{E}$ injective.

2021年9月19日 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.