@prefix ns1: <https://martial.is/entity/> .
@prefix ns2: <https://w3id.org/martialis/ontology#> .
@prefix ns3: <https://w3id.org/martialis/vocab/teacher-role/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix ns4: <https://w3id.org/martialis/vocab/source-ref-type/> .
@prefix ns5: <https://w3id.org/martialis/vocab/evidence-weight/> .
@prefix ns6: <http://www.w3.org/ns/prov#> .
@prefix ns7: <https://martial.is/agent/> .
@prefix ns8: <https://w3id.org/martialis/vocab/rank-grade/> .
@prefix schema: <https://schema.org/> .
@prefix ns9: <https://www.wikidata.org/wiki/> .
@prefix ns10: <http://www.wikidata.org/entity/> .
@prefix ns11: <http://publications.europa.eu/resource/authority/country/> .

ns1:01KZRA7SNMKFET4JQ46G8PCZFA a ns2:Person ;
    ns6:wasDerivedFrom ns1:01KZRA7SNM5AMNS6PV2NCJBQG4 ;
    schema:alternateName "Alexei Fridman"@en ;
    schema:description "Soviet-born American computer scientist and podcaster, host of the Lex Fridman Podcast. Born in\nthe Tajik Soviet Socialist Republic in 1983, his family moved to the Chicago area shortly after\nthe collapse of the Soviet Union. Trained Brazilian jiu-jitsu at Balance Studios in Philadelphia\nunder the Migliarese brothers, Phil and Ricardo, who guided him from white belt to black belt\nand awarded him the first stripe on his black belt in April 2023.\n"@en ;
    schema:image _:b5196 ;
    schema:keywords "brazilian-jiu-jitsu", "podcaster", "gracie-jiu-jitsu" ;
    schema:name "Lex Fridman"@en ;
    schema:nationality _:b5199, _:b5198 ;
    schema:sameAs ns9:Q76448707 ;
    ns2:birthEvent _:b5200 ;
    ns2:deathEvent _:b5204 ;
    ns2:hasEvidence _:b5205 ;
    ns2:hasRankAssertion _:b5213, _:b5210, _:b5206 ;
    ns2:hasTeacherAssertion _:b5223, _:b5217 ;
    ns2:trainedAt ns1:01KZRA7SNMVWK28RJGRX690B7A ;
    ns2:wasTaughtBy ns1:01KZRA7SNMKMH1HMMQEAS29X94, ns1:01KZRA7SNMVZ4732D5Z1V2GDEE .
_:b5223 a ns2:TeacherAssertion ;
    ns2:assertedStyle ns1:01KJJAWN29MA64W22606R3WD9J ;
    ns2:hasConfidence _:b5224 ;
    ns2:hasInteraction _:b5225 ;
    ns2:object ns1:01KZRA7SNMVZ4732D5Z1V2GDEE ;
    ns2:role ns3:student ;
    ns2:subject ns1:01KZRA7SNMKFET4JQ46G8PCZFA .
_:b5225 a ns2:TeacherInteraction ;
    ns6:wasDerivedFrom ns1:01KZRA7SNM80PS491Y0NFBY8NX, ns1:01KZRA7SNMDM53KK6TMKKP3NS6 ;
    ns2:hasEvidence _:b5227, _:b5226 ;
    ns2:interactionPeriod _:b5228 ;
    ns2:interactionPlace ns1:01KZRA7SNMVWK28RJGRX690B7A .
_:b5228 a ns2:TimeInterval .
_:b5227 a ns2:SourceAssertionRelation ;
    ns2:basedOnSource ns1:01KZRA7SNM80PS491Y0NFBY8NX ;
    ns2:evidenceWeight ns5:medium ;
    ns2:quotation "Migliarese also awarded a black belt to research scientist and podcaster Lex Fridman." ;
    ns2:sourceRefType ns4:secondary ;
    ns2:supports true .
_:b5226 a ns2:SourceAssertionRelation ;
    ns2:basedOnSource ns1:01KZRA7SNMDM53KK6TMKKP3NS6 ;
    ns2:evidenceWeight ns5:high ;
    ns2:quotation "I got a stripe on my jiu jitsu black belt today from Phil and Rick Migliarese who guided me from white belt to black belt, as mentors and friends." ;
    ns2:sourceRefType ns4:primary ;
    ns2:supports true .
_:b5224 a ns2:Confidence ;
    ns6:wasAttributedTo ns7:FSM ;
    ns2:assessedBy ns7:FSM ;
    ns2:confidenceLevel "2"^^<http://www.w3.org/2001/XMLSchema#integer> ;
    ns2:confidenceRationale "Lex Fridman's own Instagram post, quoted by Jiu-Jitsu Times and Jits Magazine, names Phil and Rick Migliarese as the instructors who guided him from white belt to black belt; Wikipedia corroborates that Ricardo Migliarese awarded a black belt to Lex Fridman" .
_:b5217 a ns2:TeacherAssertion ;
    ns2:assertedStyle ns1:01KJJAWN29MA64W22606R3WD9J ;
    ns2:hasConfidence _:b5218 ;
    ns2:hasInteraction _:b5219 ;
    ns2:object ns1:01KZRA7SNMKMH1HMMQEAS29X94 ;
    ns2:role ns3:student ;
    ns2:subject ns1:01KZRA7SNMKFET4JQ46G8PCZFA .
_:b5219 a ns2:TeacherInteraction ;
    ns6:wasDerivedFrom ns1:01KZRA7SNMDM53KK6TMKKP3NS6, ns1:01KZRA7SNMQ0E1TR6KQ7Z3FVAF ;
    ns2:hasEvidence _:b5221, _:b5220 ;
    ns2:interactionPeriod _:b5222 ;
    ns2:interactionPlace ns1:01KZRA7SNMVWK28RJGRX690B7A .
_:b5222 a ns2:TimeInterval .
_:b5221 a ns2:SourceAssertionRelation ;
    ns2:basedOnSource ns1:01KZRA7SNMQ0E1TR6KQ7Z3FVAF ;
    ns2:evidenceWeight ns5:medium ;
    ns2:quotation "Migliarese also awarded a black belt to research scientist and podcaster Lex Fridman." ;
    ns2:sourceRefType ns4:secondary ;
    ns2:supports true .
_:b5220 a ns2:SourceAssertionRelation ;
    ns2:basedOnSource ns1:01KZRA7SNMDM53KK6TMKKP3NS6 ;
    ns2:evidenceWeight ns5:high ;
    ns2:quotation "I got a stripe on my jiu jitsu black belt today from Phil and Rick Migliarese who guided me from white belt to black belt, as mentors and friends." ;
    ns2:sourceRefType ns4:primary ;
    ns2:supports true .
_:b5218 a ns2:Confidence ;
    ns6:wasAttributedTo ns7:FSM ;
    ns2:assessedBy ns7:FSM ;
    ns2:confidenceLevel "2"^^<http://www.w3.org/2001/XMLSchema#integer> ;
    ns2:confidenceRationale "Lex Fridman's own Instagram post, quoted by Jiu-Jitsu Times and Jits Magazine, names Phil and Rick Migliarese as the instructors who guided him from white belt to black belt; Wikipedia corroborates that Phil Migliarese awarded a black belt to Lex Fridman" .
_:b5213 a ns2:RankAssertion ;
    ns6:wasDerivedFrom ns1:01KZRA7SNMDM53KK6TMKKP3NS6, ns1:01KZRA7SNMMM7YBR8Q0QTVDCB5 ;
    schema:datePublished "2023-04" ;
    ns2:earliestYear "2023"^^<http://www.w3.org/2001/XMLSchema#integer> ;
    ns2:hasConfidence _:b5214 ;
    ns2:hasEvidence _:b5216, _:b5215 ;
    ns2:latestYear "2023"^^<http://www.w3.org/2001/XMLSchema#integer> ;
    ns2:object ns1:01KJJAWN29MA64W22606R3WD9J ;
    ns2:rankGrade ns8:bjj_black ;
    ns2:rankOrdinal "1"^^<http://www.w3.org/2001/XMLSchema#integer> ;
    ns2:rankSystem ns1:01M11YJ1XMX79NAEPJ09NWKC1S ;
    ns2:subject ns1:01KZRA7SNMKFET4JQ46G8PCZFA .
_:b5216 a ns2:SourceAssertionRelation ;
    ns2:basedOnSource ns1:01KZRA7SNMDM53KK6TMKKP3NS6 ;
    ns2:evidenceWeight ns5:high ;
    ns2:quotation "Lex Fridman Awarded First Stripe on Black Belt by Philadelphia's Migliarese Brothers" ;
    ns2:sourceRefType ns4:secondary ;
    ns2:supports true .
_:b5215 a ns2:SourceAssertionRelation ;
    ns2:basedOnSource ns1:01KZRA7SNMMM7YBR8Q0QTVDCB5 ;
    ns2:evidenceWeight ns5:high ;
    ns2:quotation "Popular podcaster and veteran grappler Lex Fridman has just been awarded the first degree on his BJJ black belt by both Rick and Phil Migliarese at Balance Studios in Philadelphia, Pennsylvania." ;
    ns2:sourceRefType ns4:secondary ;
    ns2:supports true .
_:b5214 a ns2:Confidence ;
    ns6:wasAttributedTo ns7:FSM ;
    ns2:assessedBy ns7:FSM ;
    ns2:confidenceLevel "2"^^<http://www.w3.org/2001/XMLSchema#integer> ;
    ns2:confidenceRationale "Jiu-Jitsu Times and Jits Magazine both report that Lex Fridman was awarded the first degree on his BJJ black belt by the Migliarese brothers in April 2023, announced via his own Instagram post, roughly four and a half years after his black belt promotion in November 2018" .
_:b5210 a ns2:RankAssertion ;
    ns6:wasDerivedFrom ns1:01KZS3PSKP0BMM7D77TKCXP7WT ;
    ns2:hasConfidence _:b5211 ;
    ns2:hasEvidence _:b5212 ;
    ns2:object ns1:01KJJAWN29MA64W22606R3WD9B ;
    ns2:rankSystem ns1:01M11K25NF0E7HG8HWVWM2P3FG ;
    ns2:rankType <https://w3id.org/martialis/vocab/rank-type/dan_unspecified> ;
    ns2:subject ns1:01KZRA7SNMKFET4JQ46G8PCZFA .
_:b5212 a ns2:SourceAssertionRelation ;
    ns2:basedOnSource ns1:01KZS3PSKP0BMM7D77TKCXP7WT ;
    ns2:evidenceWeight ns5:medium ;
    ns2:quotation "In a detailed video featuring a judo session, Lex Fridman, a Brazilian Jiu-Jitsu and Judo black belt and AI researcher, joins forces with Travis Stevens, a 2016 Olympic silver medalist in judo." ;
    ns2:sourceRefType ns4:secondary ;
    ns2:supports true .
_:b5211 a ns2:Confidence ;
    ns6:wasAttributedTo ns7:FSM ;
    ns2:assessedBy ns7:FSM ;
    ns2:confidenceLevel "1"^^<http://www.w3.org/2001/XMLSchema#integer> ;
    ns2:confidenceRationale "BJJ Eastern Europe describes Lex Fridman as a Brazilian Jiu-Jitsu and Judo black belt in a report on a judo training session with Travis Stevens; the claim is not yet corroborated by a primary source and the promotion date and granting instructor are unknown" .
_:b5206 a ns2:RankAssertion ;
    ns6:wasDerivedFrom ns1:01KZRA7SNM5AMNS6PV2NCJBQG4, ns1:01KZS3PSKK1T6WG2HDVGG0YE5N ;
    schema:datePublished "2018-11" ;
    ns2:earliestYear "2018"^^<http://www.w3.org/2001/XMLSchema#integer> ;
    ns2:hasConfidence _:b5207 ;
    ns2:hasEvidence _:b5209, _:b5208 ;
    ns2:latestYear "2018"^^<http://www.w3.org/2001/XMLSchema#integer> ;
    ns2:object ns1:01KJJAWN29MA64W22606R3WD9J ;
    ns2:rankGrade ns8:bjj_black ;
    ns2:rankSystem ns1:01M11YJ1XMX79NAEPJ09NWKC1S ;
    ns2:subject ns1:01KZRA7SNMKFET4JQ46G8PCZFA .
_:b5209 a ns2:SourceAssertionRelation ;
    ns2:basedOnSource ns1:01KZS3PSKK1T6WG2HDVGG0YE5N ;
    ns2:evidenceWeight ns5:high ;
    ns2:quotation "I got my BJJ black belt yesterday from Phil Migliarese and Ricardo Migliarese at Balance Studios after 9 years of hard training and competing." ;
    ns2:sourceRefType ns4:primary ;
    ns2:supports true .
_:b5208 a ns2:SourceAssertionRelation ;
    ns2:basedOnSource ns1:01KZRA7SNM5AMNS6PV2NCJBQG4 ;
    ns2:evidenceWeight ns5:medium ;
    ns2:quotation "Migliarese also awarded a black belt to research scientist and podcaster Lex Fridman." ;
    ns2:sourceRefType ns4:secondary ;
    ns2:supports true .
_:b5207 a ns2:Confidence ;
    ns6:wasAttributedTo ns7:FSM ;
    ns2:assessedBy ns7:FSM ;
    ns2:confidenceLevel "3"^^<http://www.w3.org/2001/XMLSchema#integer> ;
    ns2:confidenceRationale "Lex Fridman announced the promotion himself in a black belt speech video published on his own YouTube channel on 11 November 2018, stating he received his BJJ black belt the previous day from Phil and Ricardo Migliarese at Balance Studios after 9 years of training and competing" .
_:b5205 a ns2:SourceAssertionRelation ;
    ns2:basedOnSource ns1:01KZRA7SNM5AMNS6PV2NCJBQG4 ;
    ns2:coversProperty schema:alternateName, ns2:hasRankAssertion, schema:description, schema:name, ns2:birthEvent, schema:nationality ;
    ns2:evidenceWeight ns5:high ;
    ns2:sourceRefType ns4:secondary ;
    ns2:supports true .
_:b5204 a ns2:LifeEvent .
_:b5200 a ns2:LifeEvent ;
    ns6:wasDerivedFrom ns1:01KZRA7SNM5AMNS6PV2NCJBQG4 ;
    schema:birthDate "1983-08-15" ;
    schema:birthPlace _:b5201 ;
    ns2:earliestYear "1983"^^<http://www.w3.org/2001/XMLSchema#integer> ;
    ns2:hasEvidence _:b5203, _:b5202 ;
    ns2:latestYear "1983"^^<http://www.w3.org/2001/XMLSchema#integer> .
_:b5203 a ns2:SourceAssertionRelation ;
    ns2:basedOnSource ns1:01KZRA7SNM5AMNS6PV2NCJBQG4 ;
    ns2:evidenceWeight ns5:high ;
    ns2:quotation "Fridman was born in Chkalovsk, Tajik Soviet Socialist Republic, and grew up in Moscow. ... When he was about 11, soon after the collapse of the Soviet Union, Fridman's family moved from Russia to the Chicago area." ;
    ns2:sourceRefType ns4:secondary ;
    ns2:supports true .
_:b5202 a ns2:SourceAssertionRelation ;
    schema:citation "Lex Fridman - Wikidata" ;
    schema:url ns9:Q76448707 ;
    ns2:evidenceWeight ns5:medium ;
    ns2:sourceRefType ns4:secondary ;
    ns2:supports true .
_:b5201 schema:addressCountry ns11:SUN ;
    schema:name "Buston" ;
    schema:sameAs ns10:Q2997217 .
_:b5199 schema:addressCountry ns11:USA ;
    schema:sameAs ns10:Q30 .
_:b5198 schema:addressCountry ns11:SUN ;
    schema:sameAs ns10:Q15180 .
_:b5196 schema:contentUrl <https://upload.wikimedia.org/wikipedia/commons/5/50/Lex_Fridman_teaching_at_MIT_in_2018.png> ;
    ns2:imageAttribution _:b5197 .
_:b5197 schema:citation "Lex Fridman teaching at MIT in 2018 - Wikimedia Commons" ;
    schema:url <https://commons.wikimedia.org/wiki/File:Lex_Fridman_teaching_at_MIT_in_2018.png> ;
    ns2:evidenceWeight ns5:medium ;
    ns2:sourceRefType ns4:secondary .