A note on a family of acceptors for some families of developmental languagesFootnote†
† The work of the second author was partially supported by a National Research Council of Canada Grant No. A-7700 and partially under the auspices of the Mathematical Institute of Utrecht University.

Gregorz Rozenberg Mathematical Institute, Utrecht University, Utrecht-Uithof, Netherlands

Derick Wood Computer Science Group, Applied Mathematics Department, McMaster University, Hamilton, Ontario, L8S 4K1, Canada

Abstract

In a previous paper Rozenberg (1974) introduced the PDAC acceptors (pushdown-array-of-counters acceptors) and showed that the restricted PDACA characterize the EOL languages. In this present note the PDAPDA (pushdown-array-of-pushdowns acceptors) are introduced and it is shown that the restricted PDA² characterize the ETOL languages.

† The work of the second author was partially supported by a National Research Council of Canada Grant No. A-7700 and partially under the auspices of the Mathematical Institute of Utrecht University.

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A note on a family of acceptors for some families of developmental languagesFootnote†
† The work of the second author was partially supported by a National Research Council of Canada Grant No. A-7700 and partially under the auspices of the Mathematical Institute of Utrecht University.

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A note on a family of acceptors for some families of developmental languagesFootnote†† The work of the second author was partially supported by a National Research Council of Canada Grant No. A-7700 and partially under the auspices of the Mathematical Institute of Utrecht University.

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A note on a family of acceptors for some families of developmental languagesFootnote†
† The work of the second author was partially supported by a National Research Council of Canada Grant No. A-7700 and partially under the auspices of the Mathematical Institute of Utrecht University.