| Original language | English |
|---|---|
| Pages (from-to) | 410-423 |
| Number of pages | 14 |
| Journal | Journal of the London Mathematical Society |
| Volume | s1-37 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1962 |
| Externally published | Yes |
Bibliographical note
Funding Information:Received 15 May, 1961. Research of the first-named author was supported in part by a grant from the National Science Foundation while at the University of Rochester, Summer 1960, and by a grant-in-aid from the Institute for Advanced Study at Princeton during the academic year 1960-61. f For information on the foundations of the relational calculus see [11] (with a brief, but instructive, historical introduction). Gf. also [1, 2].