What Is It?

MacG. Dawson, Robert J.
March 2009
Mathematical Intelligencer;Spring2009, Vol. 31 Issue 2, p57
Academic Journal
The article offers information on the image found in the "Curiosum" column by Robert J. MacG. Dawson in the March 1, 2009 issue of the journal. It states that it is "complex slide rule" which could be built using a sheet of paper and an acetate photocopy. The first known planar slide rule for complex numbers was devised by J. W. M. Dumond in the 1920s according to D. J. Whyte. In 1956, Arnold Sander discovered that Faber-Castell produced an alternative design with a transparent cylinder.


Related Articles

  • hypercomplex numbers.  // Hutchinson Dictionary of Scientific Biography;2005, p1 

    Numbers that expand on complex numbers; for example, quaternions.

  • The slide rule. Coletti, Elisabetta // Christian Science Monitor;3/11/99, Vol. 91 Issue 72, p23 

    Discusses the fate of the slide rule. Importance of them; Brief history; How they work; Slide rules made obsolete by pocket calculators.

  • Cálculo. BENDER, LIONEL // Inventos;2003, p30 

    No abstract available.

  • Computation of the Yoneda Algebras for Algebras of Dihedral Type. Generalov, A.; Kosmatov, N. // Journal of Mathematical Sciences;Oct2005, Vol. 130 Issue 3, p4699 

    We continue a series of papers in which the Yoneda algebra is computed for algebras of dihedral and semidihedral types. In this paper, the Yoneda algebra is computed for one more family of algebras, namely, for the family D(3 $$\mathcal{L}$$ ) (in the classification of K. Erdmann). In order to...

  • Universal forcing notions and ideals. Roslanowski, Andrzej; Shelah, Saharon // Archive for Mathematical Logic;Apr2007, Vol. 46 Issue 3/4, p179 

    Our main result states that a finite iteration of Universal Meager forcing notions adds generic filters for many forcing notions determined by universality parameters. We also give some results concerning cardinal characteristics of the s-ideals determined by those universality parameters.

  • On multifractal of Cantor dust. In-Soo Baek // Acta Mathematica Sinica;Jul2009, Vol. 25 Issue 7, p1175 

    We consider quasi-self-similar measures with respect to all real numbers on a Cantor dust. We define a local index function on the real numbers for each quasi-self-similar measure at each point in a Cantor dust. The value of the local index function at the real number zero for all the...

  • Diameter preserving surjection on alternate matrices. Huang, Li // Acta Mathematica Sinica;Sep2009, Vol. 25 Issue 9, p1517 

    Let F be a field with | F| ≥ 3, [Figure not available: see fulltext.] be the set of all m× m ( m ≥ 4) alternate matrices over F. The arithmetic distance of A,B ∈ [Figure not available: see fulltext.] is d( A,B):= rank( A−B). If d( A,B) = 2, then A and B are said to be...

  • On conditions for univalence of two integral operators. Breaz, Daniel; Pescar, Virgil // Studia Universitatis Babes-Bolyai, Mathematica;Jun2012, Vol. 57 Issue 2, p175 

    In this paper we consider two integral operators. These operators was made based on the fact that the number of functions from their composition is entire part of the complex number modulus. The complex number is equal with the sum of the powers related to the functions from the composition of...

  • BINOMIAL SUMS AND FUNCTIONS OF EXPONENTIAL TYPE. JAVAD MASHREGHI; THOMAS RANSFORD // Bulletin of the London Mathematical Society;Jan2005, Vol. 37 Issue 1, p15 

    Let $(a_n)_{n\ge 0}$ be a sequence of complex numbers, and, for $n\,{\ge}\,0$, let \[ b_n=\sum_{k=0}^n{n\choose k}a_k\quad\hbox{and}\quad c_n=\sum_{k=0}^n{n\choose k}(-1)^{n-k}a_k. \] A number of results are proved relating the growth of the sequences $(b_n)$ and $(c_n)$ to that of $(a_n)$. For...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics