mirror symmetry where there should not be any difference between left and right;
charge symmetry, where particles behave like antiparticles, which have exactly the same properties but the opposite charge;
time symmetry, where physical events at the micro level should be equally independent whether they occur forwards or backwards in time.
In which direction is the girl moving? Is she going forwards or backwards?
She is actually going backwards. The second video is the original one while the first is played in reverse.
She is actually going forwards. The second video is the original one while the first is played in reverse.
Which girl is throwing the ball?
The girl on the left is throwing the ball. The second video is the original one while the first is played in reverse.
Βέβαια δεν συναντάμε συμμετρία μόνο στην φυσική και ιδιαιτέρως στις κινήσεις. Συμμετρία υπάρχει και στην γλώσσα μας. Για παράδειγμα τα ονόματα "Σάββας" και "Άννα" διαβάζονται και ανάποδα και ακούγονται το ίδιο. Στα Αρχαία Ελληνικά ακόμα και μία ολόκληρη φράση διαβάζεται και ανάποδα. "νιψον ανομηματα μη μοναν οψιν".
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