PL
The main aim of this article is to present two models that explain how mathematical notions are created in mind - "mental number line" and "mental number cluster". The first one was proposed by Stanislas Dehaene. According to this model, the basis of the simplest mathematical notions is the mental one-axis line, which contains discrete values of natural numbers. The second model was proposed by Wojciech Krysztofiak. In this model the basic mental representation takes the form of a cluster of numerical axes. Both models are presented from a different point of view: the "mental number line" model is presented from the neuroscientific perspective, whereas the "mental number cluster" - from the formal-logic perspective. However, the abstract nature of the former model and the experimental predictions of the latter has allowed us to compare them.