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Definition df-subma 21189
Description: Define the submatrices of a square matrix. A submatrix is obtained by deleting a row and a column of the original matrix. Since the indices of a matrix need not to be sequential integers, it does not matter that there may be gaps in the numbering of the indices for the submatrix. The determinants of such submatrices are called the "minors" of the original matrix. (Contributed by AV, 27-Dec-2018.)
Assertion
Ref Expression
df-subma subMat = (𝑛 ∈ V, 𝑟 ∈ V ↦ (𝑚 ∈ (Base‘(𝑛 Mat 𝑟)) ↦ (𝑘𝑛, 𝑙𝑛 ↦ (𝑖 ∈ (𝑛 ∖ {𝑘}), 𝑗 ∈ (𝑛 ∖ {𝑙}) ↦ (𝑖𝑚𝑗)))))
Distinct variable group:   𝑛,𝑟,𝑚,𝑖,𝑗,𝑘,𝑙

Detailed syntax breakdown of Definition df-subma
StepHypRef Expression
1 csubma 21188 . 2 class subMat
2 vn . . 3 setvar 𝑛
3 vr . . 3 setvar 𝑟
4 cvv 3480 . . 3 class V
5 vm . . . 4 setvar 𝑚
62cv 1537 . . . . . 6 class 𝑛
73cv 1537 . . . . . 6 class 𝑟
8 cmat 21019 . . . . . 6 class Mat
96, 7, 8co 7149 . . . . 5 class (𝑛 Mat 𝑟)
10 cbs 16483 . . . . 5 class Base
119, 10cfv 6343 . . . 4 class (Base‘(𝑛 Mat 𝑟))
12 vk . . . . 5 setvar 𝑘
13 vl . . . . 5 setvar 𝑙
14 vi . . . . . 6 setvar 𝑖
15 vj . . . . . 6 setvar 𝑗
1612cv 1537 . . . . . . . 8 class 𝑘
1716csn 4550 . . . . . . 7 class {𝑘}
186, 17cdif 3916 . . . . . 6 class (𝑛 ∖ {𝑘})
1913cv 1537 . . . . . . . 8 class 𝑙
2019csn 4550 . . . . . . 7 class {𝑙}
216, 20cdif 3916 . . . . . 6 class (𝑛 ∖ {𝑙})
2214cv 1537 . . . . . . 7 class 𝑖
2315cv 1537 . . . . . . 7 class 𝑗
245cv 1537 . . . . . . 7 class 𝑚
2522, 23, 24co 7149 . . . . . 6 class (𝑖𝑚𝑗)
2614, 15, 18, 21, 25cmpo 7151 . . . . 5 class (𝑖 ∈ (𝑛 ∖ {𝑘}), 𝑗 ∈ (𝑛 ∖ {𝑙}) ↦ (𝑖𝑚𝑗))
2712, 13, 6, 6, 26cmpo 7151 . . . 4 class (𝑘𝑛, 𝑙𝑛 ↦ (𝑖 ∈ (𝑛 ∖ {𝑘}), 𝑗 ∈ (𝑛 ∖ {𝑙}) ↦ (𝑖𝑚𝑗)))
285, 11, 27cmpt 5132 . . 3 class (𝑚 ∈ (Base‘(𝑛 Mat 𝑟)) ↦ (𝑘𝑛, 𝑙𝑛 ↦ (𝑖 ∈ (𝑛 ∖ {𝑘}), 𝑗 ∈ (𝑛 ∖ {𝑙}) ↦ (𝑖𝑚𝑗))))
292, 3, 4, 4, 28cmpo 7151 . 2 class (𝑛 ∈ V, 𝑟 ∈ V ↦ (𝑚 ∈ (Base‘(𝑛 Mat 𝑟)) ↦ (𝑘𝑛, 𝑙𝑛 ↦ (𝑖 ∈ (𝑛 ∖ {𝑘}), 𝑗 ∈ (𝑛 ∖ {𝑙}) ↦ (𝑖𝑚𝑗)))))
301, 29wceq 1538 1 wff subMat = (𝑛 ∈ V, 𝑟 ∈ V ↦ (𝑚 ∈ (Base‘(𝑛 Mat 𝑟)) ↦ (𝑘𝑛, 𝑙𝑛 ↦ (𝑖 ∈ (𝑛 ∖ {𝑘}), 𝑗 ∈ (𝑛 ∖ {𝑙}) ↦ (𝑖𝑚𝑗)))))
Colors of variables: wff setvar class
This definition is referenced by:  submafval  21191
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