ḥeleḳ 1. Pirḳe ʻiyun be-gidre mitsṿat ha-biṭaḥon be-mishnato shel Baʻal Ḥovot ha-levavot.

Ḥeleḳ rishon. Maʼamre musar, daʻat ṿe-yirʼat H. lefi seder parashiyot ha-Torah -- ḥeleḳ sheni. ʻIyunim be-musar ṿe-yirʼat H., pirḳe maḥshavot, maʼamre musar, maʻarakhot ha-teshuvah, shevive or.

The aging of the two brothers in the “twins paradox” is analyzed through the space-time evolution of the densities that correspond to their internal complex structure. Taking into account their relative motion, it is shown that the traveling brother evolves over a shorter interval of time than his twin, which makes him younger than his brother.

First Published in 1984. Routledge is an imprint of Taylor & Francis, an informa company.