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A matrix is a rectangular array of numbers. A matrix with m rows and n columns is called
an m × n matrix. The plural of matrix is matrices. A matrix with the same number of rows
as columns is called square. Two matrices are equal if they have the same number of rows
and the same number of columns and the corresponding entries in every position are equal.

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The sum of two matrices of the same size is obtained by adding elements in the corresponding
positions. Matrices of different sizes cannot be added, because the sum of two matrices is defined
only when both matrices have the same number of rows and the same number of columns.

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Matrix Product (or Matrix Multiplication)

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Matrix Product (or Matrix Multiplication)

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a mathematical expression that has an equal sign and
linear expressions

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a mathematical statement that performs functions of
addition, subtraction, multiplication, and division

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•A set is a collection of objects, things or symbolswhich are clearly defined.

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•A set is a collection of objects, things or symbolswhich are clearly defined.

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•A set must be properly defined so that we canfind out whether an object is a member of theset.

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•A set must be properly defined so that we canfind out whether an object is a member of theset.

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•The individual objects in a set are called themembers or elements of the set.

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•The individual objects in a set are called themembers or elements of the set.

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In set theory the concept of an empty set or null set is very important and interesting. Its definition is as follows:  “a set which contains no elements is called as empty set or null set”, and it is sometimes known as void set or vacuous set. It is usually denoted by

∅

∅; inspired by the letter Ø in the Norwegian and Danish alphabets, and not related to the Greek letter Φ.

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We can also represent sets using Venn diagrams. In a
Venn diagram, the sets are represented by shapes;
usually circles or ovals. The elements of a set are labeled
within the circle.

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PROPOSITION

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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Let p and q be propositions. The disjunction of p and q, denoted
by p v q, is the proposition “p or q.”

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Let p and q be propositions. The conjunction of p and q,
denoted by p Ù q, is the proposition “p and q.”

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I don't understand because it's too hard. I tried to study by myself but it was still difficult.

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I understand because it's easy enough and I learned it when I was in high school.