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- [[Category:PP]]671 bytes (18 words) - 15:00, 17 December 2019
- ...aracteristic equation]]''.<ref name="kline807">See {{Harvnb|Kline|1972|loc=pp. 807–808}}</ref> ...[[Poisson's equation]] a few years later.<ref>See {{Harvnb|Kline|1972|loc=pp. 706–707}}</ref>72 KB (10,692 words) - 16:55, 17 December 2012