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Theorem List for Metamath Proof Explorer - 12901-13000   *Has distinct variable group(s)
TypeLabelDescription
Statement

Theoremvdwpc 12901* The predicate " The coloring contains a polychromatic -tuple of AP's of length ". A polychromatic -tuple of AP's is a set of AP's with the same base point but different step lengths, such that each individual AP is monochromatic, but the AP's all have mutually distinct colors. (The common basepoint is not required to have the same color as any of the AP's.) (Contributed by Mario Carneiro, 18-Aug-2014.)
PolyAP AP

Theoremvdwlem1 12902* Lemma for vdw 12915. (Contributed by Mario Carneiro, 12-Sep-2014.)
AP                      MonoAP

Theoremvdwlem2 12903* Lemma for vdw 12915. (Contributed by Mario Carneiro, 12-Sep-2014.)
MonoAP MonoAP

Theoremvdwlem3 12904 Lemma for vdw 12915. (Contributed by Mario Carneiro, 13-Sep-2014.)

Theoremvdwlem4 12905* Lemma for vdw 12915. (Contributed by Mario Carneiro, 12-Sep-2014.)

Theoremvdwlem5 12906* Lemma for vdw 12915. (Contributed by Mario Carneiro, 12-Sep-2014.)
AP                      AP

Theoremvdwlem6 12907* Lemma for vdw 12915. (Contributed by Mario Carneiro, 13-Sep-2014.)
AP                      AP                                    PolyAP MonoAP

Theoremvdwlem7 12908* Lemma for vdw 12915. (Contributed by Mario Carneiro, 12-Sep-2014.)
AP        PolyAP PolyAP MonoAP

Theoremvdwlem8 12909* Lemma for vdw 12915. (Contributed by Mario Carneiro, 18-Aug-2014.)
AP               PolyAP

Theoremvdwlem9 12910* Lemma for vdw 12915. (Contributed by Mario Carneiro, 12-Sep-2014.)
MonoAP                      PolyAP MonoAP               MonoAP                      PolyAP MonoAP

Theoremvdwlem10 12911* Lemma for vdw 12915. Set up secondary induction on . (Contributed by Mario Carneiro, 18-Aug-2014.)
MonoAP               PolyAP MonoAP

Theoremvdwlem11 12912* Lemma for vdw 12915. (Contributed by Mario Carneiro, 18-Aug-2014.)
MonoAP        MonoAP

Theoremvdwlem12 12913 Lemma for vdw 12915. base case of induction. (Contributed by Mario Carneiro, 18-Aug-2014.)
MonoAP

Theoremvdwlem13 12914* Lemma for vdw 12915. Main induction on ; , base cases. (Contributed by Mario Carneiro, 18-Aug-2014.)
MonoAP

Theoremvdw 12915* Van der Waerden's theorem. For any finite coloring and integer , there is an such that every coloring function from to contains a monochromatic arithmetic progression (which written out in full means that there is a color and base, increment values such that all the numbers lie in the preimage of , i.e. they are all in and evaluated at each one yields ). (Contributed by Mario Carneiro, 13-Sep-2014.)

Theoremvdwnnlem1 12916* Corollary of vdw 12915, and lemma for vdwnn 12919. If is a coloring of the integers, then there are arbitrarily long monochromatic APs in . (Contributed by Mario Carneiro, 13-Sep-2014.)

Theoremvdwnnlem2 12917* Lemma for vdwnn 12919. The set of all "bad" for the theorem is upwards-closed, because a long AP implies a short AP. (Contributed by Mario Carneiro, 13-Sep-2014.)

Theoremvdwnnlem3 12918* Lemma for vdwnn 12919. (Contributed by Mario Carneiro, 13-Sep-2014.)

Theoremvdwnn 12919* Van der Waerden's theorem, infinitary version. For any finite coloring of the natural numbers, there is a color that contains arbitrarily long arithmetic progressions. (Contributed by Mario Carneiro, 13-Sep-2014.)

6.2.12  Ramsey's theorem

Syntaxcram 12920 Extend class notation with the Ramsey number function.
Ramsey

Theoremramtlecl 12921* The set of numbers with the Ramsey number property is upward-closed. (Contributed by Mario Carneiro, 21-Apr-2015.)

Definitiondf-ram 12922* Define the Ramsey number function. The input is a number for the size of the edges of the hypergraph, and a tuple from the finite color set to lower bounds for each color. The Ramsey number Ramsey is the smallest number such that for any set with Ramsey and any coloring of the set of -element subsets of (with color set ), there is a color and a subset such that and all the hyperedges of (that is, subsets of of size ) have color . (Contributed by Mario Carneiro, 20-Apr-2015.)
Ramsey

Theoremhashbcval 12923* Value of the "binomial set", the set of all -element subsets of . (Contributed by Mario Carneiro, 20-Apr-2015.)

Theoremhashbccl 12924* The binomial set is a finite set. (Contributed by Mario Carneiro, 20-Apr-2015.)

Theoremhashbcss 12925* Subset relation for the binomial set. (Contributed by Mario Carneiro, 20-Apr-2015.)

Theoremhashbc0 12926* The set of subsets of size zero is the singleton of the empty set. (Contributed by Mario Carneiro, 22-Apr-2015.)

Theoremhashbc2 12927* The size of the binomial set is the binomial coefficient. (Contributed by Mario Carneiro, 20-Apr-2015.)

Theorem0hashbc 12928* There are no subsets of the empty set with size greater than zero. (Contributed by Mario Carneiro, 22-Apr-2015.)

Theoremramval 12929* The value of the Ramsey number function. (Contributed by Mario Carneiro, 21-Apr-2015.)
Ramsey

Theoremramcl2lem 12930* Lemma for extended real closure of the Ramsey number function. (Contributed by Mario Carneiro, 20-Apr-2015.)
Ramsey

Theoremramtcl 12931* The Ramsey number has the Ramsey number property if any number does. (Contributed by Mario Carneiro, 20-Apr-2015.)
Ramsey

Theoremramtcl2 12932* The Ramsey number is an integer iff there is a number with the Ramsey number property. (Contributed by Mario Carneiro, 20-Apr-2015.)
Ramsey

Theoremramtub 12933* The Ramsey number is a lower bound on the set of all numbers with the Ramsey number property. (Contributed by Mario Carneiro, 20-Apr-2015.)
Ramsey

Theoremramub 12934* The Ramsey number is a lower bound on the set of all numbers with the Ramsey number property. (Contributed by Mario Carneiro, 22-Apr-2015.)
Ramsey

Theoremramub2 12935* It is sufficient to check the Ramsey property on finite sets of size equal to the upper bound. (Contributed by Mario Carneiro, 23-Apr-2015.)
Ramsey

Theoremrami 12936* The defining property of a Ramsey number. (Contributed by Mario Carneiro, 22-Apr-2015.)
Ramsey               Ramsey

Theoremramcl2 12937 The Ramsey number is either a nonnegative integer or plus infinity. (Contributed by Mario Carneiro, 20-Apr-2015.)
Ramsey

Theoremramxrcl 12938 The Ramsey number is an extended real number. (This theorem does not imply Ramsey's theorem, unlike ramcl 12950.) (Contributed by Mario Carneiro, 20-Apr-2015.)
Ramsey

Theoremramubcl 12939 If the Ramsey number is upper bounded, then it is an integer. (Contributed by Mario Carneiro, 20-Apr-2015.)
Ramsey Ramsey

Theoremramlb 12940* Establish a lower bound on a Ramsey number. (Contributed by Mario Carneiro, 22-Apr-2015.)
Ramsey

Theorem0ram 12941* The Ramsey number when . (Contributed by Mario Carneiro, 22-Apr-2015.)
Ramsey

Theorem0ram2 12942 The Ramsey number when . (Contributed by Mario Carneiro, 22-Apr-2015.)
Ramsey

Theoremram0 12943 The Ramsey number when . (Contributed by Mario Carneiro, 22-Apr-2015.)
Ramsey

Theorem0ramcl 12944 Lemma for ramcl 12950: Existence of the Ramsey number when . (Contributed by Mario Carneiro, 23-Apr-2015.)
Ramsey

Theoremramz2 12945 The Ramsey number when has value zero for some color . (Contributed by Mario Carneiro, 22-Apr-2015.)
Ramsey

Theoremramz 12946 The Ramsey number when is the zero function. (Contributed by Mario Carneiro, 22-Apr-2015.)
Ramsey

Theoremramub1lem1 12947* Lemma for ramub1 12949. (Contributed by Mario Carneiro, 23-Apr-2015.)
Ramsey               Ramsey                      Ramsey

Theoremramub1lem2 12948* Lemma for ramub1 12949. (Contributed by Mario Carneiro, 23-Apr-2015.)
Ramsey               Ramsey                      Ramsey

Theoremramub1 12949* Inductive step for Ramsey's theorem, in the form of an explicit upper bound. (Contributed by Mario Carneiro, 23-Apr-2015.)
Ramsey               Ramsey        Ramsey Ramsey

Theoremramcl 12950 Ramsey's theorem: the Ramsey number is an integer for every finite coloring and set of upper bounds. (Contributed by Mario Carneiro, 23-Apr-2015.)
Ramsey

Theoremramsey 12951* Ramsey's theorem with the definition Ramsey eliminated. If is an integer, is a specified finite set of colors, and is a set of lower bounds for each color, then there is an such that for every set of size greater than and every coloring of the set of all -element subsets of , there is a color and a subset such that is larger than and the -element subsets of are monochromatic with color . This is the hypergraph version of Ramsey's theorem; the version for simple graphs is the case . (Contributed by Mario Carneiro, 23-Apr-2015.)

6.2.13  Decimal arithmetic (cont.)

Theoremdec2dvds 12952 Divisibility by two is obvious in base 10. (Contributed by Mario Carneiro, 19-Apr-2015.)
;

Theoremdec5dvds 12953 Divisibility by five is obvious in base 10. (Contributed by Mario Carneiro, 19-Apr-2015.)
;

Theoremdec5dvds2 12954 Divisibility by five is obvious in base 10. (Contributed by Mario Carneiro, 19-Apr-2015.)
;

Theoremdec5nprm 12955 Divisibility by five is obvious in base 10. (Contributed by Mario Carneiro, 19-Apr-2015.)
;

Theoremdec2nprm 12956 Divisibility by two is obvious in base 10. (Contributed by Mario Carneiro, 19-Apr-2015.)
;

Theoremmodxai 12957 Add exponents in a power mod calculation. (Contributed by Mario Carneiro, 21-Feb-2014.) (Revised by Mario Carneiro, 5-Feb-2015.)

Theoremmod2xi 12958 Double exponents in a power mod calculation. (Contributed by Mario Carneiro, 21-Feb-2014.)

Theoremmodxp1i 12959 Add one to an exponent in a power mod calculation. (Contributed by Mario Carneiro, 21-Feb-2014.)

Theoremmod2xnegi 12960 Version of mod2xi 12958 with a negaive mod value. (Contributed by Mario Carneiro, 21-Feb-2014.)

Theoremmodsubi 12961 Subtract from within a mod calculation. (Contributed by Mario Carneiro, 18-Feb-2014.)

Theoremgcdi 12962 Calculate a GCD via Euclid's algorithm. (Contributed by Mario Carneiro, 19-Feb-2014.)

Theoremgcdmodi 12963 Calculate a GCD via Euclid's algorithm. (Contributed by Mario Carneiro, 19-Feb-2014.)

Theoremdecexp2 12964 Calculate a power of two. (Contributed by Mario Carneiro, 19-Feb-2014.)

Theoremnumexp0 12965 Calculate an integer power. (Contributed by Mario Carneiro, 17-Apr-2015.)

Theoremnumexp1 12966 Calculate an integer power. (Contributed by Mario Carneiro, 17-Apr-2015.)

Theoremnumexpp1 12967 Calculate an integer power. (Contributed by Mario Carneiro, 17-Apr-2015.)

Theoremnumexp2x 12968 Double an integer power. (Contributed by Mario Carneiro, 17-Apr-2015.)

Theoremdecsplit0b 12969 Split a decimal number into two parts. Base case: . (Contributed by Mario Carneiro, 16-Jul-2015.)

Theoremdecsplit0 12970 Split a decimal number into two parts. Base case: . (Contributed by Mario Carneiro, 16-Jul-2015.)

Theoremdecsplit1 12971 Split a decimal number into two parts. Base case: . (Contributed by Mario Carneiro, 16-Jul-2015.)
;

Theoremdecsplit 12972 Split a decimal number into two parts. Inductive step. (Contributed by Mario Carneiro, 16-Jul-2015.)
; ;

Theoremkaratsuba 12973 The Karatsuba multiplication algorithm. If and are decomposed into two groups of digits of length (only the lower group is known to be this size but the algorithm is most efficient when the partition is chosen near the middle of the digit string), then can be written in three groups of digits, where each group needs only one multiplication. Thus we can halve both inputs with only three multiplications on the smaller operands, yielding an asymptotic improvement of n^(log2 3) instead of n^2 for the "naive" algorithm decmul1c 10050. (Contributed by Mario Carneiro, 16-Jul-2015.)

Theorem2exp4 12974 Two to the fourth power is 16. (Contributed by Mario Carneiro, 20-Apr-2015.)
;

Theorem2exp6 12975 Two to the sixth power is 64. (Contributed by Mario Carneiro, 20-Apr-2015.)
;

Theorem2exp8 12976 Two to the eighth power is 256. (Contributed by Mario Carneiro, 20-Apr-2015.)
;;

Theorem2exp16 12977 Two to the sixteenth power is 65536. (Contributed by Mario Carneiro, 20-Apr-2015.)
; ;;;;

Theorem3exp3 12978 Three to the third power is 27. (Contributed by Mario Carneiro, 20-Apr-2015.)
;

Theorem2expltfac 12979 The factorial grows faster than two to the power . (Contributed by Mario Carneiro, 15-Sep-2016.)

6.2.14  Specific prime numbers

Theorem4nprm 12980 4 is not a prime number. (Contributed by Paul Chapman, 22-Jun-2011.) (Proof shortened by Mario Carneiro, 18-Feb-2014.)

Theoremprmlem0 12981* Lemma for prmlem1 12983 and prmlem2 12995. (Contributed by Mario Carneiro, 18-Feb-2014.)

Theoremprmlem1a 12982* A quick proof skeleton to show that the numbers less than 25 are prime, by trial division. (Contributed by Mario Carneiro, 18-Feb-2014.)

Theoremprmlem1 12983 A quick proof skeleton to show that the numbers less than 25 are prime, by trial division. (Contributed by Mario Carneiro, 18-Feb-2014.)
;

Theorem5prm 12984 5 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.)

Theorem6nprm 12985 6 is not a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.)

Theorem7prm 12986 7 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.)

Theorem8nprm 12987 8 is not a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.)

Theorem9nprm 12988 9 is not a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.)

Theorem10nprm 12989 10 is not a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.)

Theorem11prm 12990 11 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.)
;

Theorem13prm 12991 13 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.)
;

Theorem17prm 12992 17 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.)
;

Theorem19prm 12993 19 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.)
;

Theorem23prm 12994 23 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.)
;

Theoremprmlem2 12995 Our last proving session got as far as 25 because we started with the two "bootstrap" primes 2 and 3, and the next prime is 5, so knowing that 2 and 3 are prime and 4 is not allows us to cover the numbers less than . Additionally, nonprimes are "easy", so we can extend this range of known prime/nonprimes all the way until 29, which is the first prime larger than 25. Thus in this lemma we extend another blanket out to , from which we can prove even more primes. If we wanted, we could keep doing this, but the goal is Bertrand's postulate, and for that we only need a few large primes - we don't need to find them all, as we have been doing thus far. So after this blanket runs out we'll have to switch to another method (see 1259prm 13008).

As a side note, you can see the pattern of the primes in the indentation pattern of this lemma! (Contributed by Mario Carneiro, 18-Feb-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.)

;;                                          ;        ;        ;        ;        ;

Theorem37prm 12996 37 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.)
;

Theorem43prm 12997 43 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.)
;

Theorem83prm 12998 83 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.)
;

Theorem139prm 12999 139 is a prime number. (Contributed by Mario Carneiro, 19-Feb-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.)
;;

Theorem163prm 13000 163 is a prime number. (Contributed by Mario Carneiro, 19-Feb-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.)
;;

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