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Prove that a finite cartesian product of countable sets is countable?

here is the proof: http://planetmath.org/encyclopedia/ProductOfAFiniteNumberOfCountableSetsIsCountable.html


Show that the union of two countable sets is countable?

CHECK THIS OUT http://www.mathstat.dal.ca/~hill/2112/assn7sol.pdf


Is something that is finite always countable?

Yes, finite numbers are always countable.


What is the Difference between a finite set and countable set?

all finite set is countable.but,countable can be finite or infinite


What is difference between finite and countable sets?

A finite set is one that contains a specific, limited number of elements, while a countable set can be either finite or infinite but can be put into a one-to-one correspondence with the natural numbers. In other words, a countable set has the same size as some subset of the natural numbers, meaning it can be enumerated. For example, the set of all integers is countable, even though it is infinite, whereas the set of all even integers is also countable.


How product measure is sigma finite?

A product measure is sigma-finite if each of its component measures is sigma-finite. This means that for each component measure, the space can be decomposed into a countable union of measurable sets, each with finite measure. Consequently, when taking the product of these measures, the resulting product measure retains this property, allowing for the entire space to be covered by countably many sets of finite measure. This is crucial for the application of Fubini's theorem in integrating functions over product spaces.


Is counting measure indeed a measure and is this always sigma-finite?

It is a measure, but it isn't always sigma-finite. Take your space X = [0,1], and u = counting measure if u(E) < infinity, then E is a finite set, but there is no way to cover the uncountable set [0,1] by a countable collection of finite sets.


What does it mean by countable plate?

A countable plate refers to a type of mathematical object in set theory, where a set is considered countable if its elements can be put into a one-to-one correspondence with the natural numbers. This means that even if the set is infinite, it can still be "counted" in the sense that its elements can be listed sequentially. Countable sets include finite sets and countably infinite sets, such as the set of integers or rational numbers. In some contexts, "countable plate" might also refer to a specific type of surface or geometric object, but the term is less commonly used in that sense.


Is the set of all irrational number countable?

No, the set of all irrational numbers is not countable. Countable sets are those that can be put into a one-to-one correspondence with the natural numbers (1, 2, 3, ...). The set of irrational numbers is uncountable because it has a higher cardinality than the set of natural numbers. This was proven by Georg Cantor using his diagonalization argument.


How prove that the set of irrational numbers are uncountable?

Proof By Contradiction:Claim: R\Q = Set of irrationals is countable.Then R = Q union (R\Q)Since Q is countable, and R\Q is countable (by claim), R is countable because the union of countable sets is countable.But this is a contradiction since R is uncountable (Cantor's Diagonal Argument).Thus, R\Q is uncountable.


What is the cardinality of a union of two infinite sets?

The cardinality of finite sets are the number of elements included in them however, union of infinite sets can be different as it includes the matching of two different sets one by one and finding a solution by matching the same amount of elements in those sets.


What are finite sets?

They are sets with a finite number of elements. For example the days of the week, or the 12 months of the year. Modular arithmetic is based on finite sets.