Contents of Volume 30, Number 4
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- Some non-linear problems in approximation
- Dunham Jackson
- Trans. Amer. Math. Soc. 30 (1928), 621-629
- DOI: https://doi.org/10.1090/S0002-9947-1928-1501450-3
- Second-order differential systems with integral and $k$-point boundary conditions
- William M. Whyburn
- Trans. Amer. Math. Soc. 30 (1928), 630-640
- DOI: https://doi.org/10.1090/S0002-9947-1928-1501451-5
- Analytic functions of hypercomplex variables
- P. W. Ketchum
- Trans. Amer. Math. Soc. 30 (1928), 641-667
- DOI: https://doi.org/10.1090/S0002-9947-1928-1501452-7
- Concerning limiting sets in abstract spaces
- R. G. Lubben
- Trans. Amer. Math. Soc. 30 (1928), 668-685
- DOI: https://doi.org/10.1090/S0002-9947-1928-1501453-9
- Riesz summability for double series
- Florence M. Mears
- Trans. Amer. Math. Soc. 30 (1928), 686-709
- DOI: https://doi.org/10.1090/S0002-9947-1928-1501454-0
- The inverse problem of the calculus of variations in higher space
- David R. Davis
- Trans. Amer. Math. Soc. 30 (1928), 710-736
- DOI: https://doi.org/10.1090/S0002-9947-1928-1501455-2
- Types of motion of the gyroscope
- A. H. Copeland
- Trans. Amer. Math. Soc. 30 (1928), 737-764
- DOI: https://doi.org/10.1090/S0002-9947-1928-1501456-4
- The invariant integral and the inverse problem in the calculus of variations
- Thomas H. Rawles
- Trans. Amer. Math. Soc. 30 (1928), 765-784
- DOI: https://doi.org/10.1090/S0002-9947-1928-1501457-6
- The projective differential geometry of systems of linear homogeneous differential equations of the first order
- Ernest P. Lane
- Trans. Amer. Math. Soc. 30 (1928), 785-796
- DOI: https://doi.org/10.1090/S0002-9947-1928-1501458-8
- The behavior of a boundary value problem as the interval becomes infinite
- W. E. Milne
- Trans. Amer. Math. Soc. 30 (1928), 797-802
- DOI: https://doi.org/10.1090/S0002-9947-1928-1501459-X
- The second derivative of a polygenic function
- Edward Kasner
- Trans. Amer. Math. Soc. 30 (1928), 803-818
- DOI: https://doi.org/10.1090/S0002-9947-1928-1501460-6
- Diophantine equations in division algebras
- Ralph G. Archibald
- Trans. Amer. Math. Soc. 30 (1928), 819-837
- DOI: https://doi.org/10.1090/S0002-9947-1928-1501461-8
- On the degree of approximation to an analytic function by means of rational functions
- J. L. Walsh
- Trans. Amer. Math. Soc. 30 (1928), 838-847
- DOI: https://doi.org/10.1090/S0002-9947-1928-1501462-X
- Existence and oscillation theorems for non-linear differential systems of the second order
- William M. Whyburn
- Trans. Amer. Math. Soc. 30 (1928), 848-854
- DOI: https://doi.org/10.1090/S0002-9947-1928-1501463-1
- Errata: “A symbolic theory of formal modular covariants” [Trans. Amer. Math. Soc. 24 (1922), no. 4, 286–311; 1501227]
- Olive C. Hazlett
- Trans. Amer. Math. Soc. 30 (1928), 855
- DOI: https://doi.org/10.1090/S0002-9947-1928-1500504-5
- Errata: “On the irregular cases of the linear ordinary difference equation” [Trans. Amer. Math. Soc. 30 (1928), no. 3, 507–541; 1501443]
- C. Raymond Adams
- Trans. Amer. Math. Soc. 30 (1928), 855
- DOI: https://doi.org/10.1090/S0002-9947-1928-1500505-7