He is an expert in orthoepy, teaching pronunciation.

A positive-definite matrix is an important concept in linear algebra.

My paper is going to be presented at the Institute of Electrical and Electronics Engineers conference.

He read the Thousand and One Nights and was drawn to the charm of the Orient.

He said, 'Each person has one life, like a pike or a shrimp,' and decided to live his life with care.

Kunminjōon is a book for teaching the correct pronunciation of Hangul.

A tesseract is a four-dimensional geometric shape.

The tesseract represents a four-dimensional geometric shape.

The 正五胞體 is a simple convex polytope in four dimensions, having five vertices.

A 5-cell is a simple convex polytope in four dimensions.