Solve
Notation
The symbols that are not ordinary letters. 3 examples.
∫(expression, name, a, b) is the same integral as integ. 𝑒(z) is exp(z). That e is the mathematical italic letter, not the letter you type on the keyboard. A plain e is a name. π and pi are the same constant. ∞ and inf are +∞. ʝ is the imaginary unit. i and j are names. Derivatives, and integrals to infinity, are on Integration and derivatives.
The integral sign
∫ and integ are the same call. Both values are 1/2.
Italic e
y and z are both e¹. The plain letter e stays 4.
Pi and the imaginary unit
p is π. z is ʝ.