With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Pi is an imaginary number.
text_B: In mathematics , the irrational numbers are all the real numbers which are not rational numbers , the latter being the numbers constructed from ratios -LRB- or fractions -RRB- of integers .. mathematics. mathematics. When the ratio of lengths of two line segments is an irrational number , the line segments are also described as being incommensurable , meaning that there is no length such that each of them could be `` measured '' as being a certain integer multiple of it .. integer. integer. ratio. ratio. incommensurable. commensurability ( mathematics ). Among irrational numbers are the ratio of a circle 's circumference to its diameter , Euler 's number e , the golden ratio φ , and the square root of two ; in fact all square roots of natural numbers , other than of perfect squares , are irrational .. ratio. ratio. E ( mathematical constant ). square root of two. square root of two. natural. natural number. It can be shown that irrational numbers , when expressed in a positional numeral system -LRB- e.g. as decimal numbers , or with any other natural basis -RRB- , do not terminate , nor do they repeat , i.e. , do not contain a subsequence of digits , the repetition of which makes up the tail of the representation .. E ( mathematical constant ). natural. natural number. repeat. repeating decimal. For example , the decimal representation of the number starts with 3.14159265358979 , but no finite number of digits can represent exactly , nor does it repeat .. repeat. repeating decimal. The proof that the decimal expansion of a rational number must terminate or repeat is distinct from the proof that a decimal expansion that terminates or repeats must be a rational number , and although elementary and not lengthy , both proofs take some work .. rational number. rational number. repeat. repeating decimal. Mathematicians do not generally take `` terminating or repeating '' to be the definition of the concept of rational number .. rational number. rational number. Irrational numbers may also be dealt with via non-terminating continued fractions .. non-terminating continued fractions. Continued fraction#Infinite continued fractions and convergents. As a consequence of Cantor 's proof that the real numbers are uncountable and the rationals countable , it follows that almost all real numbers are irrational .. uncountable. uncountable. rationals. rational number. almost all. almost all
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