In "The Department of Sensitive Crimes," Ulf makes a bold and flirtatious comment about a friend, describing her as "algebraic." This unusual expression indicates a deeper admiration but also signifies a potential crossing of boundaries, as likening someone to a mathematical construct is not typical in friendly banter.

The remark reflects Ulf's unexpected feelings, suggesting that he sees something intriguing in her personality akin to an abstract concept. However, the immediate regret that follows hints at his awareness of the social implications and risks associated with such an intimate comparison, making the moment both uncomfortable and revealing.