## On a conjecture of the semigroup of fully indecomposable relations.(English)Zbl 0384.20051

### MSC:

 20M20 Semigroups of transformations, relations, partitions, etc. 05C20 Directed graphs (digraphs), tournaments
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### References:

 [1] Dulmage A. L., Mendelsohn N. S.: Gaps in the exponent set of primitive matrices. Illinois J. of Math. 8 (1964), 642-656. · Zbl 0125.00706 [2] Heap B. R., Lynn M. S.: The index of primitivity of a non-negative matrix. Numerische Math. 6 (1964), 120-141. · Zbl 0121.26303 [3] Holladay J. C., Varga R. S.: On powers of non-negative matrices. Proc. Amer. Math. Soc. 9 (1958), 631-634. · Zbl 0096.00805 [4] Schwarz Š.: The semigroup of fully indecomposable relations and Hall relations. Czechoslovak Math. J., 23 (1973), 151-163. · Zbl 0261.20057 [5] Schwarz Š.: A new approach to some problems in the theory of non-negative matrices. Czechoslovak Math. J., 16 (1966), 274-283. · Zbl 0232.20140 [6] Wielandt H.: Unzerlegbare, nicht negativen Matrizen. Math. Zeit. 52 (1950), 642-648. · Zbl 0035.29101
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