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Definition 2024

unlesss

unlesss

English

Abbreviation

unlesss

(mathematics, logic) Precisely unless.
- 1990, James Glimm, The Legacy of John Von Neumann, American Mathematical Society, ISBN 0821814877, page 279,
  Partial Order: G ≥ H unlesss (unless and only unless) H ≥ some G^R or some H^L ≥ G.
- 1999, V. K. Balachandran, Topological Algebras, 2000 North-Holland edition, ISBN 0444506098, pages 78–79 :
  A subset $S$ is called absorbing if to each $x\in X$ there is a real number $\epsilon =\epsilon _{x}>0$ such that $\lambda x\in S$ for all $\lambda$ with $0<\left|\lambda \right|\leq \epsilon$ . Trivially the set $X$ is absorbing; on the other hand $\{0\}$ can never be absorbing (unlesss $X=\{0\}$ ).
- 2004, William Fraser, Susan Hirshberg, and David Wolfe, "The Structure of the Distributive Lattice of Games Born by Day n", in Integers: Electronic Journal of Combinatorial Number Theory 5(2) (2005), page 2,
  G ≥ H unlesss H ≥ G^R or H^L ≥ G for some G^R ∈ G^R or some H^L ∈ H^L. ¶ (Analogous to “iff”, the term “unlesss” means “unless and only unless”.)

References

MathWorld

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