Do you know that you can write this equation with your keyboard in Japanese input mode?
Δθ₀ = η × 1÷√(var(θ₀) + ε) × ∇(θ₀)
For example, θ can be input by しーた. ε can be input by いぷしろん, etc.
The exhaustive list of these symbols and the associated key combination can
