## Experimental Mathematics

- Experiment. Math.
- Volume 19, Issue 4 (2010), 431-446.

### Higher-Dimensional Box Integrals

Jonathan M. Borwein, O-Yeat Chan, and R. E. Crandall

#### Abstract

Herein, with the aid of substantial symbolic computation, we solve previously open problems in the theory of $n$-dimensional box integrals $B_n(s) := \langle|\vec{r}|^s\rangle, \vec{r} ∈ [0, 1]^n$. In particular, we resolve an elusive integral called $\mathcal{K}_5$ that previously acted as a “blockade” against closed-form evaluation in $n = 5$ dimensions. In consequence, we now know that $B_n$(integer) can be given a closed form for $n = 1, 2, 3, 4, 5$. We also find the general residue at the pole at $s = −n$, this leading to new relations and definite integrals; for example, we are able to give the first nontrivial closed forms for six-dimensional box integrals and to show hyperclosure of $B_6$(even). The Clausen function and its generalizations play a central role in these higher-dimensional evaluations. Our results provide stringent test scenarios for symbolic-algebra simplification methods.

#### Article information

**Source**

Experiment. Math. Volume 19, Issue 4 (2010), 431-446.

**Dates**

First available in Project Euclid: 4 October 2011

**Permanent link to this document**

http://projecteuclid.org/euclid.em/1317758103

**Mathematical Reviews number (MathSciNet)**

MR2778656

**Zentralblatt MATH identifier**

06074861

**Keywords**

Box integral trilogarithm arctan integral

#### Citation

Borwein, Jonathan M.; Chan, O-Yeat; Crandall, R. E. Higher-Dimensional Box Integrals. Experiment. Math. 19 (2010), no. 4, 431--446. http://projecteuclid.org/euclid.em/1317758103.