See Furry's theorem on Wiktionary
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"In quantum electrodynamics, a theorem stating that if a Feynman diagram consists of a closed loop of fermion lines with an odd number of vertices, its contribution to the amplitude vanishes (and therefore a single photon cannot arise from the vacuum or be absorbed by it)."
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"(physics) In quantum electrodynamics, a theorem stating that if a Feynman diagram consists of a closed loop of fermion lines with an odd number of vertices, its contribution to the amplitude vanishes (and therefore a single photon cannot arise from the vacuum or be absorbed by it)."
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Download raw JSONL data for Furry's theorem meaning in All languages combined (1.6kB)
This page is a part of the kaikki.org machine-readable All languages combined dictionary. This dictionary is based on structured data extracted on 2026-08-07 from the enwiktionary dump dated 2026-08-05 using wiktextract (d9fa233 and 9e92f4b). The data shown on this site has been post-processed and various details (e.g., extra categories) removed, some information disambiguated, and additional data merged from other sources. See the raw data download page for the unprocessed wiktextract data.
If you use this data in academic research, please cite Tatu Ylonen: Wiktextract: Wiktionary as Machine-Readable Structured Data, Proceedings of the 13th Conference on Language Resources and Evaluation (LREC), pp. 1317-1325, Marseille, 20-25 June 2022. Linking to the relevant page(s) under https://kaikki.org would also be greatly appreciated.