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a set of numbers arranged in rows and columns so as to form a rectangular array

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Example when identity matrix do product 

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Example when identity matrix do product 

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absolutely with python ;)

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Set theory is the branch of mathematical logic that studies sets, which can be informally described as collections of objects. Although objects of any kind can be collected into a set, set theory, as a branch of mathematics, is mostly concerned with those that are relevant to mathematics as a whole.

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is a widely used diagram style that shows the logical relation between sets, popularized by John Venn in the 1880s. The diagrams are used to teach elementary set theory, and to illustrate simple set relationships in probability, logic, statistics, linguistics and computer science. A Venn diagram uses simple closed curves drawn on a plane to represent sets. Very often, these curves are circles or ellipses.

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The complement of the set X ∪Y is the set of elements that
are members of the universal set U but are not in X ∪Y. It is
denoted by (X ∪ Y ) ’

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The dyadic operation between two sets S and T, say, resulting in the set S − T consisting of those elements that are in S but not in T. Formally S − T = {s | s ∈ S and s ∉ T} Set difference is a generalization of the idea of the complement of a set and as such is sometimes called the relative complement of T with respect to S. The symmetric difference between two sets S and T is the union of S − T and T − S.

S − T = {s | s ∈ S and s ∉ T}

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เข้าใจภาพรวมส่วนมาก

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งง ในสัญลักษณ์บางอย่าง สลับกันบ้างเล็กน้อย

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non

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Definition
A proposition (p, q, r, ...) is simply a statement (i.e., a
declarative sentence) with a definite meaning, having a truth
value that’s either true (T) or false (F) (never both, neither,
or somewhere in between).

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ภาษาโค้ดกับตัวเลขทำให้เข้าใจหลักการง่ายขึ้น

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งง เรื่อง F T ในบางหัวข้ออยู่บ้าง