type tag
STRUCTURE
SYNOPSIS
Abstract type of oracle tags.
DESCRIPTION
The type tag is used to track the use of oracles in HOL. An ‘oracle’ is a source of theorems that are not proved, but just asserted. In HOL, such unproven ‘theorems’ are used to incorporate the results of external proof tools. Each theorem coming from an oracle has a tag attached to it. This tag gets copied to any theorems hereditarily generated from an oracular theorem by inference.
SEEALSO
HOL  Kananaskis-10