List of equivalences

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(First list of equivalences)

Revision as of 15:43, 28 October 2013

Each isomorphism gives an equivalence of formulas. The following equivalences are not isomorphisms.

Contents

Additives

\begin{array}{rclcrcl} A \with A &\linequiv& A \\ A \plus A &\linequiv& A \\ \\ A \with (A \plus B) &\linequiv& A &\quad& A \plus \top &\linequiv& \top \\ A \plus (A \with B) &\linequiv& A &\quad& A \with \zero &\linequiv& \zero \end{array}

Quantifiers

\begin{array}{rcll} \forall X.A &\linequiv& A &\quad (X\notin A) \\ \exists X.A &\linequiv& A &\quad (X\notin A) \end{array}

Polarities

\wn N \linequiv N   (N negative)
\oc P \linequiv P   (P positive)
\wn\oc R \linequiv R   (R regular)
\oc\wn L \linequiv L   (L co-regular)

Second order encodings

\begin{array}{rclcrcl} A &\linequiv &\forall X . (A \tens X\orth) \parr X \\ A &\linequiv &\exists X . (A \parr X\orth) \tens X \\ \\ A \with B &\linequiv& \exists X . \oc{(A \parr X\orth)} \tens \oc{(B \parr X\orth)} \tens X &\quad& \top &\linequiv& \exists X . X \\ A \plus B &\linequiv& \forall X . \wn{(A \tens X\orth)} \parr \wn{(B \tens X\orth)} \parr X &\quad& \zero &\linequiv& \forall X . X \\ \\ \bot &\linequiv& \exists X . X\tens X\orth \\ \one &\linequiv& \forall X . X\orth\parr X \\ \\ \forall \xi . A &\linequiv& \exists X . (\forall \xi . (A \parr X\orth)) \tens X \\ \exists \xi . A &\linequiv& \forall X . (\exists \xi . (A \tens X\orth)) \parr X \end{array}

Miscellaneous

\begin{array}{rcl} \oc{\wn{(\oc{A}\with\oc{B})}} &\linequiv& \oc{(\wn{\oc{A}}\with\wn{\oc{B}})} \\ \wn{\oc{(\wn{A}\plus\wn{B})}} &\linequiv& \wn{(\oc{\wn{A}}\plus\oc{\wn{B}})} \end{array}

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