𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A characterization of graphical covers

✍ Scribed by A.R. Bednarek; R.E. Osteen


Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
226 KB
Volume
57
Category
Article
ISSN
0012-365X

No coin nor oath required. For personal study only.


πŸ“œ SIMILAR VOLUMES


On Tutt's Characterization of graphic ma
✍ A. M. H. Gerards πŸ“‚ Article πŸ“… 1995 πŸ› John Wiley and Sons 🌐 English βš– 409 KB

## Abstract In this paper we present a relatively simple proof of Tutt's characterization of graphic matroids. The proof uses the notion of β€˜signed graph’ and it is β€˜graphic’ in the sense that it can be presented almost entirely by drawing (signed) graphs. Β© 1995 John Wiley & Sons, Inc.

A characterization of exactly covering c
✍ Aviezri S. Fraenkel πŸ“‚ Article πŸ“… 1973 πŸ› Elsevier Science 🌐 English βš– 454 KB

If every nonnegative integer occurs in exactly one of the integer sequences QiU+$, It = 0, 1,2, . . . . 0 < 41 (... Lam, 0 5 bi < aj, i = 1, . . . . m, then the system ain + bi is called an exactly covering system (ECS). Our main result is that ain f bi is an ECS if and only if I%! \_ ape1 B,(bi/ai)

A simple characterization of disjoint co
✍ Ε tefan ZnΓ‘m πŸ“‚ Article πŸ“… 1975 πŸ› Elsevier Science 🌐 English βš– 288 KB

a system of arithmetic sequences to ith 0 G a < ?I. y a(n) dGnote the set of all where s is an teger. A system . If(f)isa S, then putting z = -1 in (3) we get ~ll~~xP[~~l -'. 1) + eee + ~xp[~~]/(exp[~~] -11) = l/(e -1). ow the opp,osi te is sbvious. in [2] that (1) is

Chordal characterization of graphic matr
✍ Wiktor Piotrowski πŸ“‚ Article πŸ“… 1988 πŸ› Elsevier Science 🌐 English βš– 722 KB

In this paper we present the characterization of graphic matroids using the concept of a chord. Then we apply this characterization to solve a problem of Szamkolowicz [9]. One of the deepest theorems in the theory of matroids is Tuttes excludedminor characterization of graphic matroids [ 111. The p

Characterization of the Οƒ-cover of a com
✍ V. K. Zaharov; A. V. Koldunov πŸ“‚ Article πŸ“… 1982 πŸ› John Wiley and Sons 🌐 English βš– 657 KB

By Y. K. ZAHAROY and A. 1'. K o r . ~r x o r of Leningrad (R,eceired March 27. 1981) In [ i ] and [2] the notion of u-cover of a compact space was introduced. A compact space a> is called a u -c o w of c( coinpnct spcrce S iff it is the smallest basically disconnected ( = a-extremally disconnected)