[1] Yotse la-or ʻal yede ṭalmidaṿ shomʻe liḳḥo be-yerakh ha-eṭanim di-shenaṭ 2016 -- [2] Yotse la-or ʻal yede ṭalmidaṿ shomʻe liḳḥo be-yerakh ha-eṭanim di-shenaṭ 2018.

-- -- ḥeleḳ 3. Shaʻar ha-teḥinah -- ḥeleḳ 4. Shaʻar ha-segulot.

An academic anthology on Jewish studies and education in memory of dr. Avraham Zalkin.

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.