Input: `3`, `-2/5`, `0.75`, `1.5` (empty cell = 0). The maximum size (2…20, default 10) is set in **Settings**.
## Parameter in elements
Cells can contain a parameter (the letter is selected in Settings, by default `a`): `2a+1`, `a^2-1`, `(a+1)(a-2)`, `1/(a-1)`.
- **det(A)** – as a polynomial factored; at which values A is invertible.
- **rank(A), RREF** – general case + special values with their rank.
- **A⁻¹** – with rational functions and a validity condition.
- **System A x = b** – full study: general case (solution as a function of the parameter) and each special case separately (incompatible / unique / countless solutions).
- +, −, ·, k·A (k may contain the parameter), Aᵀ, tr, Aᵏ.
For other operations (eigenvalues, LU, Gram–Schmitt…) enter a specific value in the "Parameter value" field.
The calculations run in a background thread. The "Result → A" button transfers the matrix result for the next operation.