
 BI 
  The logic of bunched implications, BI, is a substructural system which freely combines an additive (intuitionistic) and a multiplicative (linear) implication via bunches (contexts with two combining operations, one which admits Weakening and Contraction and one which does not). 
  Specifically, we start with the multiplicative fragment of linear logic and extend, on the one hand, to linear logic with its additives and, on the other, to the additives of the logic of bunched implications (BI). 
  The logic of bunched implications, BI, provides a logical analysis of a basic notion of resource rich enough, for example, to form the logical basis for ``pointer logic'' and ``separation logic'' semantics for programs which manipulate mutable data structures. 
 www.cs.bath.ac.uk /~pym/BI.html (1345 words) 
