Diferenca simetrike e bashkësive: Dallime mes rishikimesh
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Rreshti 3:
==Formulimi==
<center>{{mate|A{{diferenc}}B {{
==Simboli==
<math>\nabla</math>
==Shembuj==
P.sh. : {{mate|{a, b, c}{{diferenc}}{b, d, e, f}{{
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