Notations

Logical systems

For a given logical system such as MLL (for multiplicative linear logic), we consider the following variations:

Notation	Meaning	Connectives
MLL	propositional without units	$X,{\tens},{\parr}$
MLLu	propositional with units only	$\one,\bot,{\tens},{\parr}$
MLL0	propositional with units and variables	$X,\one,\bot,{\tens},{\parr}$
MLL1	first-order without units	$X\vec{t},{\tens},{\parr},\forall x A,\exists x A$
MLL01	first-order with units	$X\vec{t},\one,\bot,{\tens},{\parr},\forall x A,\exists x A$
MLL2	second-order propositional without units	$X,{\tens},{\parr},\forall X A,\exists X A$
MLL02	second-order propositional with units	$X,\one,\bot,{\tens},{\parr},\forall X A,\exists X A$
MLL12	first-order and second-order without units	$X\vec{t},{\tens},{\parr},\forall x A,\exists x A,\forall X A,\exists X A$
MLL012	first-order and second-order with units	$X\vec{t},\one,\bot,{\tens},{\parr},\forall x A,\exists x A,\forall X A,\exists X A$

Formulas and proof trees

Formulas

• First order quantification: $\forall x A$
• Second order quantification: $\forall X A$
• Quantification of arbitrary order (mainly first or second): $\forall\alpha A$

Rule names

Name of the connective, followed by some additional information if required, followed by "L" for a left rule or "R" for a right rule. For example: $\wedge_1 \text{add} L$.