411 REFERENCE · Wiktionary
Sobel sequence
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
50% * If Hannah had drunk coffee, she would be happy.
If Hannah had drunk coffee and the coffee had gasoline in it, she would not be happy.
If Hannah had drunk coffee and the coffee had gasoline in it and Hannah were a gasoline-drinking robot, she would be happy.
Etymology
Named after Jordan Howard Sobel.
Noun
en logic A lengthening series of conditionals of the form "if A then X, but if A and B then not X".
en eponyms