McCuaig and Ota conjectured that every sufficiently large 3-connected graph G contains a connected subgraph H on k vertices such that G&V(H) is 2-connected. We prove the weaker statement that every sufficiently large 3-connected graph G contains a not necessarily connected subgraph H on k vertices s
A Class of Spaces Containing all Connected and all Locally Connected Spaces
β Scribed by J. K. Kohli
- Publisher
- John Wiley and Sons
- Year
- 1978
- Tongue
- English
- Weight
- 507 KB
- Volume
- 82
- Category
- Article
- ISSN
- 0025-584X
No coin nor oath required. For personal study only.
β¦ Synopsis
A simultaneous generalization of connectedness and local connectedness, called sum connectedness, is introduced. The category of sum cohnected spaces forms the smallest co-reflective subcategory of TOP contaihing all connected spaces. A product theorem, analogous t o that for locally connected spaces, is proved for sum connected spaces and a necessary and sufficient condition for the STONE-CECH compactificetion of a TYCHONOFF space t o be sum connected is obtained. 1) See FRANKLIN [7] for the definition.
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We investigate some properties of graphs whose cycle space has a basis constituted of triangles ('null-homotopic' graphs). We obtain characterizations in the case of planar graphs, and more generally, of graphs not contractible onto Ks. These characterizations involve separating subsets and decompos
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