IntrinsicCondition

Returns the intrinsic condition under which this specific operation is defined,
not including conditions from child expressions.

This represents the inherent domain restrictions of the operation itself.
For example:
- For division (x/y): returns "y ≠ 0" (the divisor must be non-zero)
- For power (x^y): returns conditions for 0^0, 0^negative, etc.
- For logarithm log(b, x): returns "b > 0 and b ≠ 1 and x > 0"
- For addition (x + y): returns Boolean.True (no restrictions)
- For tan(x): returns "cos(x) ≠ 0"

Child expression conditions are handled separately by the DomainCondition property.