ISBN-13: 9781138919907 / Angielski / Miękka / 2016 / 166 str.
ISBN-13: 9781138919907 / Angielski / Miękka / 2016 / 166 str.
In this volume, originally published in 1970, an attempt is made to examine the more logical aspects of thinking, such as the ability to abstract and the manner in which concepts develop.