# unlesss

## English

### Etymology

Attributed to John Horton Conway. From unless, by analogy with the formation of iff from if.

### Conjunction

unlesss

1. () Precisely unless.
• 1990, James Glimm, The Legacy of John Von Neumann, American Mathematical Society, →ISBN, page 279,
Partial Order: GH unlesss (unless and only unless) H ≥ some GR or some HLG.
• 1999, V. K. Balachandran, Topological Algebras, 2000 North-Holland edition, →ISBN, pages 78–79 [1]:
A subset ${\displaystyle S}$  is called absorbing if to each ${\displaystyle x\in X}$  there is a real number ${\displaystyle \epsilon =\epsilon _{x}>0}$  such that ${\displaystyle \lambda x\in S}$  for all ${\displaystyle \lambda }$  with ${\displaystyle 0<\left|\lambda \right|\leq \epsilon }$ . Trivially the set ${\displaystyle X}$  is absorbing; on the other hand ${\displaystyle \{0\}}$  can never be absorbing (unlesss ${\displaystyle X=\{0\}}$ ).
• 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,
GH     unlesss HGR or HLG for some GRGR or some HLHL. ¶ (Analogous to “iff”, the term “unlesss” means “unless and only unless”.)