**Fact Retrieval and Deductive Question-Answering Information Retrieval Systems**

William S. Cooper

Pages: 117-137

DOI: 10.1145/321217.321218

Information Retrieval systems may be classified either as Document Retrieval systems or Fact Retrieval systems. It is contended that at least some of the latter will require the capability for performing logical deductions among natural language...

**Automatic Document Classification Part II . Additional Experiments**

Harold Borko, Myrna Bernick

Pages: 138-151

DOI: 10.1145/321217.321219

This study reports the results of a series of experiments in the techniques of automatic document classification. Two different classification schedules are compared along with two methods of automatically classifying documents into categories....

**Input Data Source Limitations for Real-Time Operation of Digital Computers**

R. Schroeder

Pages: 152-158

DOI: 10.1145/321217.321220

The purpose of this paper is to consider the limiting conditions associated with the handling of many unrelated input data sources by a digital computer which utilizes binary internal logic. Equations are derived which relate the number of...

**Single-Scan Techniques for the Translation of Arithmetic Expressions in ALGOL 60**

B. Randell, L. J. Russell

Pages: 159-167

DOI: 10.1145/321217.321221

The first section of the paper contains a brief description of the well-known technique of using a stack, or pushdown store, to re-order the operators of an arithmetic expression, as defined in ALGOL 60, in order to transform the expression into...

**Function Evaluation in Unnormalized Arithmetic**

R. L. Ashenhurst

Pages: 168-187

DOI: 10.1145/321217.321222

The evaluation of a function of one argument is a standard computational task. When an unnormalized number representation is used, it is appropriate that function evaluation to subject to certain “adjustment” criteria, defined...

**Generalized Multistep Predictor-Corrector Methods**

William B. Gragg, Hans J. Stetter

Pages: 188-209

DOI: 10.1145/321217.321223

The order p which is obtainable with a stable k-step method in the numerical solution of y′ = f(x, y) is limited to p =...

**Convergence of Multipoint Iterative Methods**

Leonard Tornheim

Pages: 210-220

DOI: 10.1145/321217.321224

**Multivariable Curve Interpolation**

James Ferguson

Pages: 221-228

DOI: 10.1145/321217.321225

The problem of defining a smooth surface through an array of points in space is well known. Several methods of solution have been proposed. Generally, these restrict the set of points to be one-to-one defined over a planar rectangular grid...

**Tables for the Step-by-Step Integration of Ordinary Differential Equations of the First Order**

William F. Pickard

Pages: 229-233

DOI: 10.1145/321217.321226

A study is made of the step-by-step integration of ordinary differential equations of the first order by means of formulas obtained from the Gregory-Newton backward interpolating formula. Tables of relevant constants are presented.

**Algebraic Specification of Statistical Models for Analysis of Variance Computations**

W. J. Hemmerle

Pages: 234-239

DOI: 10.1145/321217.321227

A method for computing an analysis of variance from an algebraic specification of the statistical model is described. The model is written in a form consistent with usual statistical notation but also suitable for computer input and logical...

**Digital Computer System for Dynamic Analysis of Speech and Sound Feedback Mechanisms**

K. U. Smith, S. D. Ansell, J. Koehler, G. H. Servos

Pages: 240-251

DOI: 10.1145/321217.321228

The aim of the research reported is to put the laboratory application of closed-loop digital computer systems to experimental control and analysis in biology and behavioral science on a formal basis, using special concepts of programming to...