Masatsugu is my best friend.

Shosuke is my best friend.

Kazumasa is my best friend.

This electronic circuit is designed using positive logic.

Positive charge is a type of electric charge of matter.

It's very interesting to learn about the history of the Shōkei era.

Hiragana is one of the characters in Japanese.

I am a believer in Orthodoxy.

In linear algebra, the upper triangular matrix plays a very important role.

A diagonal matrix is a matrix in which all elements outside the main diagonal are zero.