Abbreviation

Partial Order: G'' ? ''H'' unlesss (unless and only unless) ''H'' ? some ''G''^''R'' or some ''H''^''L'' ? ''G .

A subset $S$ is called absorbing if to each $x\backslash in\; X$ there is a real number $\backslash epsilon=\backslash epsilon\_x>0$ such that $\backslash lambda\; x\backslash in\; S$ for all $\backslash lambda$ with . Trivially the set $X$ is absorbing; on the other hand $\backslash \{0\backslash \}$ can never be absorbing (unlesss $X=\backslash \{0\backslash \}$).

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”.)