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Theorem List for Intuitionistic Logic Explorer - 7301-7400   *Has distinct variable group(s)
TypeLabelDescription
Statement

Theoremelprnql 7301 An element of a positive real's lower cut is a positive fraction. (Contributed by Jim Kingdon, 28-Sep-2019.)

Theoremelprnqu 7302 An element of a positive real's upper cut is a positive fraction. (Contributed by Jim Kingdon, 28-Sep-2019.)

Theorem0npr 7303 The empty set is not a positive real. (Contributed by NM, 15-Nov-1995.)

Theoremprcdnql 7304 A lower cut is closed downwards under the positive fractions. (Contributed by Jim Kingdon, 28-Sep-2019.)

Theoremprcunqu 7305 An upper cut is closed upwards under the positive fractions. (Contributed by Jim Kingdon, 25-Nov-2019.)

Theoremprubl 7306 A positive fraction not in a lower cut is an upper bound. (Contributed by Jim Kingdon, 29-Sep-2019.)

Theoremprltlu 7307 An element of a lower cut is less than an element of the corresponding upper cut. (Contributed by Jim Kingdon, 15-Oct-2019.)

Theoremprnmaxl 7308* A lower cut has no largest member. (Contributed by Jim Kingdon, 29-Sep-2019.)

Theoremprnminu 7309* An upper cut has no smallest member. (Contributed by Jim Kingdon, 7-Nov-2019.)

Theoremprnmaddl 7310* A lower cut has no largest member. Addition version. (Contributed by Jim Kingdon, 29-Sep-2019.)

Theoremprloc 7311 A Dedekind cut is located. (Contributed by Jim Kingdon, 23-Oct-2019.)

Theoremprdisj 7312 A Dedekind cut is disjoint. (Contributed by Jim Kingdon, 15-Dec-2019.)

Theoremprarloclemlt 7313 Two possible ways of contracting an interval which straddles a Dedekind cut. Lemma for prarloc 7323. (Contributed by Jim Kingdon, 10-Nov-2019.)

Theoremprarloclemlo 7314* Contracting the lower side of an interval which straddles a Dedekind cut. Lemma for prarloc 7323. (Contributed by Jim Kingdon, 10-Nov-2019.)
+Q0 ~Q0 ·Q0 +Q0 ~Q0 ·Q0

Theoremprarloclemup 7315 Contracting the upper side of an interval which straddles a Dedekind cut. Lemma for prarloc 7323. (Contributed by Jim Kingdon, 10-Nov-2019.)
+Q0 ~Q0 ·Q0 +Q0 ~Q0 ·Q0

Theoremprarloclem3step 7316* Induction step for prarloclem3 7317. (Contributed by Jim Kingdon, 9-Nov-2019.)
+Q0 ~Q0 ·Q0 +Q0 ~Q0 ·Q0

Theoremprarloclem3 7317* Contracting an interval which straddles a Dedekind cut. Lemma for prarloc 7323. (Contributed by Jim Kingdon, 27-Oct-2019.)
+Q0 ~Q0 ·Q0 +Q0 ~Q0 ·Q0

Theoremprarloclem4 7318* A slight rearrangement of prarloclem3 7317. Lemma for prarloc 7323. (Contributed by Jim Kingdon, 4-Nov-2019.)
+Q0 ~Q0 ·Q0 +Q0 ~Q0 ·Q0

Theoremprarloclemn 7319* Subtracting two from a positive integer. Lemma for prarloc 7323. (Contributed by Jim Kingdon, 5-Nov-2019.)

Theoremprarloclem5 7320* A substitution of zero for and minus two for . Lemma for prarloc 7323. (Contributed by Jim Kingdon, 4-Nov-2019.)
+Q0 ~Q0 ·Q0

Theoremprarloclem 7321* A special case of Lemma 6.16 from [BauerTaylor], p. 32. Given evenly spaced rational numbers from to (which are in the lower and upper cuts, respectively, of a real number), there are a pair of numbers, two positions apart in the even spacing, which straddle the cut. (Contributed by Jim Kingdon, 22-Oct-2019.)
+Q0 ~Q0 ·Q0

Theoremprarloclemcalc 7322 Some calculations for prarloc 7323. (Contributed by Jim Kingdon, 26-Oct-2019.)
+Q0 ~Q0 ·Q0

Theoremprarloc 7323* A Dedekind cut is arithmetically located. Part of Proposition 11.15 of [BauerTaylor], p. 52, slightly modified. It states that given a tolerance , there are elements of the lower and upper cut which are within that tolerance of each other.

Usually, proofs will be shorter if they use prarloc2 7324 instead. (Contributed by Jim Kingdon, 22-Oct-2019.)

Theoremprarloc2 7324* A Dedekind cut is arithmetically located. This is a variation of prarloc 7323 which only constructs one (named) point and is therefore often easier to work with. It states that given a tolerance , there are elements of the lower and upper cut which are exactly that tolerance from each other. (Contributed by Jim Kingdon, 26-Dec-2019.)

Theoremltrelpr 7325 Positive real 'less than' is a relation on positive reals. (Contributed by NM, 14-Feb-1996.)

Theoremltdfpr 7326* More convenient form of df-iltp 7290. (Contributed by Jim Kingdon, 15-Dec-2019.)

Theoremgenpdflem 7327* Simplification of upper or lower cut expression. Lemma for genpdf 7328. (Contributed by Jim Kingdon, 30-Sep-2019.)

Theoremgenpdf 7328* Simplified definition of addition or multiplication on positive reals. (Contributed by Jim Kingdon, 30-Sep-2019.)

Theoremgenipv 7329* Value of general operation (addition or multiplication) on positive reals. (Contributed by Jim Kingon, 3-Oct-2019.)

Theoremgenplt2i 7330* Operating on both sides of two inequalities, when the operation is consistent with . (Contributed by Jim Kingdon, 6-Oct-2019.)

Theoremgenpelxp 7331* Set containing the result of adding or multiplying positive reals. (Contributed by Jim Kingdon, 5-Dec-2019.)

Theoremgenpelvl 7332* Membership in lower cut of general operation (addition or multiplication) on positive reals. (Contributed by Jim Kingdon, 2-Oct-2019.)

Theoremgenpelvu 7333* Membership in upper cut of general operation (addition or multiplication) on positive reals. (Contributed by Jim Kingdon, 15-Oct-2019.)

Theoremgenpprecll 7334* Pre-closure law for general operation on lower cuts. (Contributed by Jim Kingdon, 2-Oct-2019.)

Theoremgenppreclu 7335* Pre-closure law for general operation on upper cuts. (Contributed by Jim Kingdon, 7-Nov-2019.)

Theoremgenipdm 7336* Domain of general operation on positive reals. (Contributed by Jim Kingdon, 2-Oct-2019.)

Theoremgenpml 7337* The lower cut produced by addition or multiplication on positive reals is inhabited. (Contributed by Jim Kingdon, 5-Oct-2019.)

Theoremgenpmu 7338* The upper cut produced by addition or multiplication on positive reals is inhabited. (Contributed by Jim Kingdon, 5-Dec-2019.)

Theoremgenpcdl 7339* Downward closure of an operation on positive reals. (Contributed by Jim Kingdon, 14-Oct-2019.)

Theoremgenpcuu 7340* Upward closure of an operation on positive reals. (Contributed by Jim Kingdon, 8-Nov-2019.)

Theoremgenprndl 7341* The lower cut produced by addition or multiplication on positive reals is rounded. (Contributed by Jim Kingdon, 7-Oct-2019.)

Theoremgenprndu 7342* The upper cut produced by addition or multiplication on positive reals is rounded. (Contributed by Jim Kingdon, 7-Oct-2019.)

Theoremgenpdisj 7343* The lower and upper cuts produced by addition or multiplication on positive reals are disjoint. (Contributed by Jim Kingdon, 15-Oct-2019.)

Theoremgenpassl 7344* Associativity of lower cuts. Lemma for genpassg 7346. (Contributed by Jim Kingdon, 11-Dec-2019.)

Theoremgenpassu 7345* Associativity of upper cuts. Lemma for genpassg 7346. (Contributed by Jim Kingdon, 11-Dec-2019.)

Theoremgenpassg 7346* Associativity of an operation on reals. (Contributed by Jim Kingdon, 11-Dec-2019.)

Theoremaddnqprllem 7347 Lemma to prove downward closure in positive real addition. (Contributed by Jim Kingdon, 7-Dec-2019.)

Theoremaddnqprulem 7348 Lemma to prove upward closure in positive real addition. (Contributed by Jim Kingdon, 7-Dec-2019.)

Theoremaddnqprl 7349 Lemma to prove downward closure in positive real addition. (Contributed by Jim Kingdon, 5-Dec-2019.)

Theoremaddnqpru 7350 Lemma to prove upward closure in positive real addition. (Contributed by Jim Kingdon, 5-Dec-2019.)

Theoremaddlocprlemlt 7351 Lemma for addlocpr 7356. The case. (Contributed by Jim Kingdon, 6-Dec-2019.)

Theoremaddlocprlemeqgt 7352 Lemma for addlocpr 7356. This is a step used in both the and cases. (Contributed by Jim Kingdon, 7-Dec-2019.)

Theoremaddlocprlemeq 7353 Lemma for addlocpr 7356. The case. (Contributed by Jim Kingdon, 6-Dec-2019.)

Theoremaddlocprlemgt 7354 Lemma for addlocpr 7356. The case. (Contributed by Jim Kingdon, 6-Dec-2019.)

Theoremaddlocprlem 7355 Lemma for addlocpr 7356. The result, in deduction form. (Contributed by Jim Kingdon, 6-Dec-2019.)

Theoremaddlocpr 7356* Locatedness of addition on positive reals. Lemma 11.16 in [BauerTaylor], p. 53. The proof in BauerTaylor relies on signed rationals, so we replace it with another proof which applies prarloc 7323 to both and , and uses nqtri3or 7216 rather than prloc 7311 to decide whether is too big to be in the lower cut of (and deduce that if it is, then must be in the upper cut). What the two proofs have in common is that they take the difference between and to determine how tight a range they need around the real numbers. (Contributed by Jim Kingdon, 5-Dec-2019.)

Theoremaddclpr 7357 Closure of addition on positive reals. First statement of Proposition 9-3.5 of [Gleason] p. 123. Combination of Lemma 11.13 and Lemma 11.16 in [BauerTaylor], p. 53. (Contributed by NM, 13-Mar-1996.)

Theoremplpvlu 7358* Value of addition on positive reals. (Contributed by Jim Kingdon, 8-Dec-2019.)

Theoremmpvlu 7359* Value of multiplication on positive reals. (Contributed by Jim Kingdon, 8-Dec-2019.)

Theoremdmplp 7360 Domain of addition on positive reals. (Contributed by NM, 18-Nov-1995.)

Theoremdmmp 7361 Domain of multiplication on positive reals. (Contributed by NM, 18-Nov-1995.)

Theoremnqprm 7362* A cut produced from a rational is inhabited. Lemma for nqprlu 7367. (Contributed by Jim Kingdon, 8-Dec-2019.)

Theoremnqprrnd 7363* A cut produced from a rational is rounded. Lemma for nqprlu 7367. (Contributed by Jim Kingdon, 8-Dec-2019.)

Theoremnqprdisj 7364* A cut produced from a rational is disjoint. Lemma for nqprlu 7367. (Contributed by Jim Kingdon, 8-Dec-2019.)

Theoremnqprloc 7365* A cut produced from a rational is located. Lemma for nqprlu 7367. (Contributed by Jim Kingdon, 8-Dec-2019.)

Theoremnqprxx 7366* The canonical embedding of the rationals into the reals, expressed with the same variable for the lower and upper cuts. (Contributed by Jim Kingdon, 8-Dec-2019.)

Theoremnqprlu 7367* The canonical embedding of the rationals into the reals. (Contributed by Jim Kingdon, 24-Jun-2020.)

Theoremrecnnpr 7368* The reciprocal of a positive integer, as a positive real. (Contributed by Jim Kingdon, 27-Feb-2021.)

Theoremltnqex 7369 The class of rationals less than a given rational is a set. (Contributed by Jim Kingdon, 13-Dec-2019.)

Theoremgtnqex 7370 The class of rationals greater than a given rational is a set. (Contributed by Jim Kingdon, 13-Dec-2019.)

Theoremnqprl 7371* Comparing a fraction to a real can be done by whether it is an element of the lower cut, or by . (Contributed by Jim Kingdon, 8-Jul-2020.)

Theoremnqpru 7372* Comparing a fraction to a real can be done by whether it is an element of the upper cut, or by . (Contributed by Jim Kingdon, 29-Nov-2020.)

Theoremnnprlu 7373* The canonical embedding of positive integers into the positive reals. (Contributed by Jim Kingdon, 23-Apr-2020.)

Theorem1pr 7374 The positive real number 'one'. (Contributed by NM, 13-Mar-1996.) (Revised by Mario Carneiro, 12-Jun-2013.)

Theorem1prl 7375 The lower cut of the positive real number 'one'. (Contributed by Jim Kingdon, 28-Dec-2019.)

Theorem1pru 7376 The upper cut of the positive real number 'one'. (Contributed by Jim Kingdon, 28-Dec-2019.)

Theoremaddnqprlemrl 7377* Lemma for addnqpr 7381. The reverse subset relationship for the lower cut. (Contributed by Jim Kingdon, 19-Aug-2020.)

Theoremaddnqprlemru 7378* Lemma for addnqpr 7381. The reverse subset relationship for the upper cut. (Contributed by Jim Kingdon, 19-Aug-2020.)

Theoremaddnqprlemfl 7379* Lemma for addnqpr 7381. The forward subset relationship for the lower cut. (Contributed by Jim Kingdon, 19-Aug-2020.)

Theoremaddnqprlemfu 7380* Lemma for addnqpr 7381. The forward subset relationship for the upper cut. (Contributed by Jim Kingdon, 19-Aug-2020.)

Theoremaddnqpr 7381* Addition of fractions embedded into positive reals. One can either add the fractions as fractions, or embed them into positive reals and add them as positive reals, and get the same result. (Contributed by Jim Kingdon, 19-Aug-2020.)

Theoremaddnqpr1 7382* Addition of one to a fraction embedded into a positive real. One can either add the fraction one to the fraction, or the positive real one to the positive real, and get the same result. Special case of addnqpr 7381. (Contributed by Jim Kingdon, 26-Apr-2020.)

Theoremappdivnq 7383* Approximate division for positive rationals. Proposition 12.7 of [BauerTaylor], p. 55 (a special case where and are positive, as well as ). Our proof is simpler than the one in BauerTaylor because we have reciprocals. (Contributed by Jim Kingdon, 8-Dec-2019.)

Theoremappdiv0nq 7384* Approximate division for positive rationals. This can be thought of as a variation of appdivnq 7383 in which is zero, although it can be stated and proved in terms of positive rationals alone, without zero as such. (Contributed by Jim Kingdon, 9-Dec-2019.)

Theoremprmuloclemcalc 7385 Calculations for prmuloc 7386. (Contributed by Jim Kingdon, 9-Dec-2019.)

Theoremprmuloc 7386* Positive reals are multiplicatively located. Lemma 12.8 of [BauerTaylor], p. 56. (Contributed by Jim Kingdon, 8-Dec-2019.)

Theoremprmuloc2 7387* Positive reals are multiplicatively located. This is a variation of prmuloc 7386 which only constructs one (named) point and is therefore often easier to work with. It states that given a ratio , there are elements of the lower and upper cut which have exactly that ratio between them. (Contributed by Jim Kingdon, 28-Dec-2019.)

Theoremmulnqprl 7388 Lemma to prove downward closure in positive real multiplication. (Contributed by Jim Kingdon, 10-Dec-2019.)

Theoremmulnqpru 7389 Lemma to prove upward closure in positive real multiplication. (Contributed by Jim Kingdon, 10-Dec-2019.)

Theoremmullocprlem 7390 Calculations for mullocpr 7391. (Contributed by Jim Kingdon, 10-Dec-2019.)

Theoremmullocpr 7391* Locatedness of multiplication on positive reals. Lemma 12.9 in [BauerTaylor], p. 56 (but where both and are positive, not just ). (Contributed by Jim Kingdon, 8-Dec-2019.)

Theoremmulclpr 7392 Closure of multiplication on positive reals. First statement of Proposition 9-3.7 of [Gleason] p. 124. (Contributed by NM, 13-Mar-1996.)

Theoremmulnqprlemrl 7393* Lemma for mulnqpr 7397. The reverse subset relationship for the lower cut. (Contributed by Jim Kingdon, 18-Jul-2021.)

Theoremmulnqprlemru 7394* Lemma for mulnqpr 7397. The reverse subset relationship for the upper cut. (Contributed by Jim Kingdon, 18-Jul-2021.)

Theoremmulnqprlemfl 7395* Lemma for mulnqpr 7397. The forward subset relationship for the lower cut. (Contributed by Jim Kingdon, 18-Jul-2021.)

Theoremmulnqprlemfu 7396* Lemma for mulnqpr 7397. The forward subset relationship for the upper cut. (Contributed by Jim Kingdon, 18-Jul-2021.)

Theoremmulnqpr 7397* Multiplication of fractions embedded into positive reals. One can either multiply the fractions as fractions, or embed them into positive reals and multiply them as positive reals, and get the same result. (Contributed by Jim Kingdon, 18-Jul-2021.)

Theoremaddcomprg 7398 Addition of positive reals is commutative. Proposition 9-3.5(ii) of [Gleason] p. 123. (Contributed by Jim Kingdon, 11-Dec-2019.)

Theoremaddassprg 7399 Addition of positive reals is associative. Proposition 9-3.5(i) of [Gleason] p. 123. (Contributed by Jim Kingdon, 11-Dec-2019.)

Theoremmulcomprg 7400 Multiplication of positive reals is commutative. Proposition 9-3.7(ii) of [Gleason] p. 124. (Contributed by Jim Kingdon, 11-Dec-2019.)

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