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Unrecoverable Partition: Is There still Hope?

**Unrecoverable partition: is there still hope?**

I just used MiniTool Partition Wizard Free to solve my issue here, which involved rescuing a partition that TestDisk could not. However, my issuer was not identical to yours, so I cannot be certain that this would work.Why did you change the disk from dynamic to basic?.

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**In a measurable partition of an interval, the sum of the measures of the subsets in the partition equals the length of the interval**

Let's start with $(1)$. Since $F_j subset E_j subset [a,b]$, we only have to see that $[a,b] subset bigcup_j F_j$. Take $x in [a,b]$ and let $s = minn : x in E_j$. This is well defined because there exists some $j$ for which $x in E_j$ since the $E_j$s partition $[a,b]$. By construction, $x in E_s$ but necessarily, $x

ot in E_t$ when $t ight|. tag$star$ $$However, by hypothesis we have that$$ left|bigcup_i ight| leq sum_i

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**Refinement of partitions**

A partition of a set X is a refinement of a partition of X-and we say that is finer than and that is coarser than -if every element of is a subset of some element of . Informally, this means that is a further fragmentation of . In that case, it is written that . This finer-than relation on the set of partitions of X is a partial order (so the notation "" is appropriate). Each set of elements has a least upper bound and a greatest lower bound, so that it forms a lattice, and more specifically (for partitions of a finite set) it is a geometric lattice. The partition lattice of a 4-element set has 15 elements and is depicted in the Hasse diagram on the left. Based on the cryptomorphism between geometric lattices and matroids, this lattice of partitions of a finite set corresponds to a matroid in which the base set of the matroid consists of the atoms of the lattice, namely, the partitions with n 2 displaystyle n-2 singleton sets and one two-element set. These atomic partitions correspond one-for-one with the edges of a complete graph. The matroid closure of a set of atomic partitions is the finest common coarsening of them all; in graph-theoretic terms, it is the partition of the vertices of the complete graph into the connected components of the subgraph formed by the given set of edges. In this way, the lattice of partitions corresponds to the lattice of flats of the graphic matroid of the complete graph. Another example illustrates the refining of partitions from the perspective of equivalence relations. If D is the set of cards in a standard 52-card deck, the same-color-as relation on D - which can be denoted C - has two equivalence classes: the sets red cards and black cards. The 2-part partition corresponding to C has a refinement that yields the same-suit-as relation S, which has the four equivalence classes spades, diamonds, hearts, and clubs.

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**Ferrers diagrams for plane partitions**

Another representation for plane partitions is in the form of Ferrers diagrams. The Ferrers diagram of a plane partition of n displaystyle n is a collection of n displaystyle n points or nodes, = ( y 1 , y 2 , ... , y n ) displaystyle lambda =(mathbf y _1,mathbf y _2,ldots ,mathbf y _n) , with y i Z 0 3 displaystyle mathbf y _iin mathbb Z _geq 0^3 satisfying the condition: Condition FD: If the node a = ( a 1 , a 2 , a 3 ) displaystyle mathbf a =(a_1,a_2,a_3)in lambda , then so do all the nodes y = ( y 1 , y 2 , y 3 ) displaystyle mathbf y =(y_1,y_2,y_3) with 0 y i a i displaystyle 0leq y_ileq a_i for all i = 1 , 2 , 3 displaystyle i=1,2,3 .Replacing every node of a plane partition by a unit cube with edges aligned with the axes leads to the stack of cubes representation for the plane partition. Equivalence of the two representationsGiven a Ferrers diagram, one constructs the plane partition (as in the main definition) as follows. Let i , j displaystyle pi _i,j be the number of nodes in the Ferrers diagram with coordinates of the form ( i 1 , j 1 , ) displaystyle (i-1,j-1,*) where displaystyle * denotes an arbitrary value. The collection i , j displaystyle pi _i,j form a plane partition. One can verify that condition FD implies that the conditions for a plane partition are satisfied.Given a set of i , j displaystyle pi _i,j that form a plane partition, one obtains the corresponding Ferrers diagram as follows. Start with the Ferrers diagram with no nodes. For every non-zero i , j displaystyle pi _i,j , add i , j displaystyle pi _i,j nodes of the form ( i 1 , j 1 , y 3 ) displaystyle (i-1,j-1,y_3) for 0 y 3 ight)qquad Longleftrightarrow qquad beginmatrix2&11&1endmatrix Above, every node of the Ferrers diagram is written as a column and we have only written only the non-vanishing i , j displaystyle pi _i,j as is conventional.

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