Merge pull request #1 from Spinachboul/Spinachboul-Update-Readme

Update tensor_prod.md

docs/src/tensor_prod.md

@@ -1,6 +1,9 @@
 # Tensor product function
-The tensor product function is defined as:
-``f(x) = \prod_{i=1}^d \cos(a\pi x_i)``
+A tensor product function combines multiple functions or vectors using the tensor product operation. The tensor product is a mathematical operation that takes two vectors and produces another vector space, capturing their joint behavior across multiple dimensions.
+
+For instance, consider a tensor product function defined as follows:
+
+```\[ f(x) = ∏ᵢ=₁ᵈ cos(aπxᵢ) \]```
 
 Let's import Surrogates and Plots:
 ```@example tensor
@@ -38,3 +41,15 @@ plot!(xs,f.(xs), label="True function", legend=:top)
 plot!(xs, loba_1.(xs), label="Lobachevsky", legend=:top)
 plot!(xs, krig.(xs), label="Kriging", legend=:top)
 ```
+
+## Kriging Plot
+
+![kriging](https://github.com/Spinachboul/Surrogates.jl/assets/105979087/bf6e2c3d-21e0-46d2-9af4-98ec38e6c462)
+
+## Lobachevsky Plot
+
+![lobachevsky](https://github.com/Spinachboul/Surrogates.jl/assets/105979087/743c2f4c-14b5-4c90-89dd-1a57a53a81dd)
+
+## Combined Plot
+
+![combined_plot](https://github.com/Spinachboul/Surrogates.jl/assets/105979087/c325ee43-2bb9-4876-9a95-4e902113f2b6)