Can there be subscript/superscript support? Maybe something like:

a_0 » a₀

a_n » aₙ

a^2 » a²

a^n » aⁿ

In the case of exponents becoming superscript, this can be an option, and you could maybe have the "subscript character" be something other than "_" to avoid potential issues with variable names.

But with the addition of subscript, I feel it could lead the way to adding support for defining arithmetic/geometric sequences. (and maybe other functions in future?)

Example of a sequence:

aₙ = a₁ + 5n, a₁ = 3 |

a₁ | 3

a₄ | 23

a₄ == 3 + (5 * 4) | true

If you want to define a range where the sequence works, you could do something like desmos:

aₙ = a₁ + 5n, a₁ = 3 {1 <= n <= 5} |

a₁ | 3

a₄ | 23

a₄ == 3 + (5 * 4) | true

a₀ | RangeError

a₅ | 28

a₆ | RangeError

// some error thrown saying n is outside designated valid range

The "item position" in a sequence ("n" in the above examples) can only be an integer, so an error could be thrown there too:

aₙ = a₁ + 5n, a₁ = 3 {1 <= n <= 5} |

a₁ | 3

a₄ | 23

a₄ == 3 + (5 * 4) | true

a_3.5 | ValueError

// pretend the 3.5 is subscript, as it would be from above.