operator ∏ ∑ ∫

Change the script style of the operator ∏ ∑ ∫ to be as the operator ∀.

Ex:

( ( ∀ ( x + y = x * y ) ) ( ( x ^ 2 + 2 * x * y + y ^ 2 ) / ∂ x * ∂ y ) )
just produce a collection of ( ( x ^ 2 + 2 * x * y + y ^ 2 ) / ∂ x * ∂ y ) by ( x + y = x * y )

( ( ∫ ( x + y = x * y ) ) ( ( x ^ 2 + 2 * x * y + y ^ 2 ) / ∂ x * ∂ y ) )
the same as ∑
get the sum of a collection of ( ( x ^ 2 + 2 * x * y + y ^ 2 ) / ∂ x * ∂ y ) by ( x + y = x * y )

( ( ∏ ( x + y = x * y ) ) ( ( x ^ 2 + 2 * x * y + y ^ 2 ) / ∂ x * ∂ y ) )
get the product of a collection of ( ( x ^ 2 + 2 * x * y + y ^ 2 ) / ∂ x * ∂ y ) by ( x + y = x * y )