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What is the origin of the symbol of integral in mathematics?

It is an elongated letter S, from the Latin "summa" (sum)
It is a curled symbol /, meaning division
It symbolizes two brackets connected together
It is a letter f, from the English "function"
The notation was introduced by the German mathematician Gottfried Wilhelm Leibniz in 1675 in his private writings; The symbol was based on the ſ (long s) character, and was chosen because Leibniz thought of the integral as an infinite sum of infinitesimal summands.
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It is an elongated letter S, from the Latin "summa" (sum)
It is a curled symbol /, meaning division
It symbolizes two brackets connected together
It is a letter f, from the English "function"
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flagAustralia
85%
5%
5%
5%
20
flagthe Netherlands
76%
0%
9%
14%
21
flagFrance
75%
6%
12%
6%
16
flagCanada
71%
7%
0%
21%
14
flagGhana
70%
20%
0%
10%
10
flagthe United States
63%
11%
9%
14%
92
flagSpain
60%
20%
0%
20%
10
flagRepublic of Ireland
58%
16%
25%
0%
12
flagGreece
57%
14%
19%
9%
21
flagPoland
51%
9%
13%
25%
5308
flagIndia
51%
18%
10%
18%
58
flagGermany
49%
13%
16%
21%
61
flagthe United Kingdom
45%
8%
20%
25%
75
flagAustria
40%
0%
50%
0%
10
flagEgypt
38%
30%
15%
15%
13

What is the sum of the opposite sides of a dice?

5
6
7
8

Augustus was born on 1 January 10BC. Which birthday did he celebrate at 1 January 10AD?

19
20
21
80

How many edges does a Möbius strip have?

one
two
three
four

How much of the Earth's ice is in Antarctica?

about 90%
about 80%
about 70%
about 65%