Similar to Mathematica

FORMAC

General algebraic modeling system

TI-Nspire series

TI-92 series

Desmos

Risch algorithm

LyX

Mathematical software

DOT (graph description language)

General Mission Analysis Tool

Systems Tool Kit

Windows Calculator

Microsoft Math Solver

Mathematics

0.999...

Zero-dimensional space

Zero to the power of zero

One-dimensional space

1 + 1 + 1 + 1 + ⋯

1 + 2 + 3 + 4 + ⋯

1 + 2 + 4 + 8 + ⋯

Root of unity

Ones' complement

1 − 1 + 2 − 6 + 24 − 120 + ⋯

1 − 2 + 3 − 4 + ⋯