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Usage

Multiplication in Mathsys is straightforward with the * operator: 
12 * 13

6 * 7
Division is also available with the / operator: 
4 / 3

2 / 9
You can combine them both in an expression: 
2 * 3 / 5

6 * 7 / 11

6 / 7 * 4
and operator precedence is respected with summation and subtraction: 
1 + 1 / 5

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Implicit multiplication

Multiplication is also available implicitly, without needing to write the operator each time: 
12x

6 - 4y

4 3
A space is not required between variables and numbers.

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Fraction carryover

Fraction carryover is the property that allows you to maintain the position on a fraction when relying on implicit multiplication. It means that whenever * is used, the position is reset to numerator, but if implicif multiplication is used, the position is inherited from the previous element: 
# this is three times y
3y

# this is one over (two x)
1 / 2x

# this is six over (seven times eight)
6 / 7 8

# this is one half times four
1 / 2*4