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 Feb 7 asked Homotopy of a (non-spherical) cow. Jun 5 awarded Yearling May 30 awarded Citizen Patrol May 23 revised How to express $2 \cos X = \sin X$ in terms of $\sin X$? added a tag May 23 suggested approved edit on How to express $2 \cos X = \sin X$ in terms of $\sin X$? May 21 awarded Constituent May 7 awarded Caucus Apr 1 comment Formal Variational Calculus Reference Request Arnold's book "Mathematical Methods of Classical Mechanics" has something to say about that. You might be also interested in Bleecker's "Gauge theory and variational principles" Feb 20 awarded Informed Jan 27 comment Multivariable Limits Well, it's replacing, say, log(a^z) by $\log(a^z)$, etc. You can edit your own answer correcting that. Take a look at tobi.oetiker.ch/lshort/lshort.pdf Jan 26 comment Multivariable Limits It'S not that hard :). What you wrote here is mainly only missing a pair of $ enclosing the math. Jan 25 awarded Custodian Jan 25 reviewed Reviewed Multivariable Limits Jan 25 comment Multivariable Limits Would you mind writing in TeX format? please? Jan 23 revised Is length adimensional when space is not flat? added 209 characters in body Jan 23 revised Describing the algebra of functions on$S^2$added 39 characters in body Jan 23 comment Describing the algebra of functions on$S^2$indeed, sorry :), well, it's negative. Have a look at M. Paschkes' Ph.D. thesis., page 43. Browse "paschke" here wwwthep.physik.uni-mainz.de/Publications/theses Jan 23 revised Describing the algebra of functions on$S^2$added 39 characters in body Jan 23 answered Describing the algebra of functions on$S^2\$ Jan 23 revised Is length adimensional when space is not flat? added 1 characters in body