Date: 2017-07-10 04:05 pm (UTC)
vot kak raz na vopros chto takoje ravenstvo, sovremennaja geometrija otvechajet v stile: vot to chto fiziceski ravno to i ravno. NESMOTRJA na to chto matematicheski opredelitj ravenstvo bylo by gorazdo udobnjeje drugim sposobom (bez zerkaljnogo otrazhenija)

dva treugoljnika ravny jesli ja mogu odin zamenitj drugim i nichego ne slomajeca.

a chto takoje poljza dokazateljstva?
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