Now I will a rhyme construct,
By chosen words the young instruct.
Cunningly divised endeavour,
Con it and remember ever.
Widths in circle here you see,
Sketched out in strange obscurity.
Назовите символ, которым впервые воспользовался британский математик Джонс и ставший общепринятым после работ Эйлера.
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