Wikipedia:Reference desk/Archives/Mathematics/2016 October 6
| Mathematics desk | ||
|---|---|---|
| < October 5 | << Sep | October | Nov >> | October 7 > |
| Welcome to the Wikipedia Mathematics Reference Desk Archives |
|---|
| The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
October 6[edit]
Can someone prove rigorous the spherical trigonometric identities/laws without using Linear algebra? יהודה שמחה ולדמן (talk) 12:37, 6 October 2016 (UTC)
- Historically linear algebra is much later than spherical trigonometry, so the answer is yes. Bo Jacoby (talk) 16:31, 6 October 2016 (UTC).
- OK, I'd like to see formal proofs for the Cosine rules and sine rules. יהודה שמחה ולדמן (talk) 17:50, 6 October 2016 (UTC)
- Do you mean along the lines of Spherical law of cosines#Proof without vectors? Probably the 1886 Todhunter book has this. --Mark viking (talk) 20:57, 6 October 2016 (UTC)
- I think we need a sketch review for this on that page. יהודה שמחה ולדמן (talk) 22:35, 6 October 2016 (UTC)
- Do you mean along the lines of Spherical law of cosines#Proof without vectors? Probably the 1886 Todhunter book has this. --Mark viking (talk) 20:57, 6 October 2016 (UTC)
- OK, I'd like to see formal proofs for the Cosine rules and sine rules. יהודה שמחה ולדמן (talk) 17:50, 6 October 2016 (UTC)