Dear Antonia, 

For a quick overview of changes in stem classes in the Vedic period, I find Martin Kümmel's "Liste vedischer Verbstämme und -Formen" to be extremely useful:

https://www.oriindufa.uni-jena.de/iskvomedia/indogermanistik/Kümmel_vved.pdf

It's based (in part) on the works already cited by Profs Korn and Parpola (and other works, of course). Innovative present stem classes are easy to find if you skim through and keep an eye out for arrows.

Also, there's a new dissertation on the nasal presents by Albert Zasada (LMU Munich), which you can add to the list of monographs on Vedic verbal morphology.

All the best, 

Dieter

On Sat, Jul 25, 2020 at 10:08 AM Asko Parpola via INDOLOGY <indology@list.indology.info> wrote:
Gotō, Toshifumi, 2013. Old Indo-Aryan morphology and its Indo-Iranian background. In co-operation with Jared S. Klein and Velizar Sadovski. (Veröffentlichungen zur Iranistik, Nr 60; Österreichische Akademie der Wissenschaften, Philosophisch-historische Klasse, Sitzungsberichte, 849. Band.) Wien: Verlag der Österreichischen Akademie der Wissenschaften. ii, 222, vi pp. ISBN 3-7001-6948-2.

On 25 Jul 2020, at 10.31, Asko Parpola <aparpola@gmail.com> wrote:

Dear Antonia:

Werba, Chlodwig H., 1997. Verba Indoarica: Die primären und sekundären Wurzeln der Sanskrit-Sprache. Pars I: Radices primariae. Wien: Verlag der Österreichischen Akademie der Wissenschaften. viii, 590 pp. ISBN 3-7001-2628-X.

Werba, Chlodwig H., forthcoming posthumously. Verba Indoarica. Pars II: Radices secundariae.

Gotō, Toshifumi, 1987. Die "I. Präsensklasse" im Vedischen. Untersuchung der vollstufigen thematischen Wurzelpräsentia. (Veröffentlichungen der Kommission für Linguistik und Kommunikationsforschung, 18; Österreichische Akademie der Wissenschaften, Phil.-hist. Klasse, Sitzungsberichte 489.) Wien: Verlag der Österreichischen Akademie der Wissenschaften. 450 pp.  ISBN 3-7001-1119-3. 

Gotō, Toshifumi, 1990. Materialien zu einer Liste altindischer Verbalformen: 1. am(i), 2. ay/i, 3. as/s. Bulletin of the National Museum of Ethnology (Osaka) 15: 987-1012.

Gotō, Toshifumi, 1991. Materialien zu einer Liste altindischer Verbalformen: 4. dogh/dugh/doh/duh, 5. sav/su, 6. (1) sav(i)/sū, 7. (2) sav(i)/sū. Bulletin of the National Museum of Ethnology (Osaka) 16: 681-707.

Gotō, Toshifumi, 1993. Materialien zu einer Liste altindischer Verbalformen: 8. ard/ṛd, 9. īṣ, 10. ukṣ, 11. eṣ/iṣ, 12. eś(i)/iṣ(i), 13. ok/oc/uc, 14. kaṇ, 15. vakṣ/ukṣ. Bulletin of the National Museum of Ethnology (Osaka) 19: 119-141.

Gotō, Toshifumi, 1997. Materialien zu einer Liste altindischer Verbalformen: 16. chad, 17. chand/chad, 18. chard/chṛd, 19. dagh/dhag, 20. dveṣ/dviṣ, 21. bandh/badh, 22. (1) man, 23 (2) man, 24. mnā, 25. (1) yav/yu, 26. (2) yav/yu, 27. san(i), 28 star/stṛ, 29. star(i)/stṛṛ.. Bulletin of the National Museum of Ethnology (Osaka) 22: 1001-1059.

Gotō, Toshifumi, 2001. Review of Werba, Verba Indoarica, Pars I. Kratylos 46: 62-72.

With best wishes, Asko

On 24 Jul 2020, at 22.05, Antonia Ruppel via INDOLOGY <indology@list.indology.info> wrote:

Dear all,

Is there an overview or systematic study of Sanskrit verbal roots either changing what present-tense stem class they belong to, or moving towards belonging to more than one class? (I am particularly looking for verbs moving into/also taking on forms of Class X, but am also wondering about movement towards thematic formations more generally. So far, my searches haven't had any useful results.)

I was going to go through Whitney to make a list of my own; but before doing that, I thought I'd check whether the kalpataru might have a piece of fruit all ready for me.

Many thanks,
     Antonia


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