YES activeU11ttNmarkNactiveU21ttMNmarksplusNMactiveU31ttmark0activeU41ttMNmarkplusxNMNactiveandttXmarkXactiveisNat0markttactiveisNatplusV1V2markandisNatV1isNatV2activeisNatsV1markisNatV1activeisNatxV1V2markandisNatV1isNatV2activeplusN0markU11isNatNNactiveplusNsMmarkU21andisNatMisNatNMNactivexN0markU31isNatNactivexNsMmarkU41andisNatMisNatNMNmarkU11X1X2activeU11markX1X2markttactivettmarkU21X1X2X3activeU21markX1X2X3marksXactivesmarkXmarkplusX1X2activeplusmarkX1markX2markU31XactiveU31markXmark0active0markU41X1X2X3activeU41markX1X2X3markxX1X2activexmarkX1markX2markandX1X2activeandmarkX1X2markisNatXactiveisNatXU11markX1X2U11X1X2U11X1markX2U11X1X2U11activeX1X2U11X1X2U11X1activeX2U11X1X2U21markX1X2X3U21X1X2X3U21X1markX2X3U21X1X2X3U21X1X2markX3U21X1X2X3U21activeX1X2X3U21X1X2X3U21X1activeX2X3U21X1X2X3U21X1X2activeX3U21X1X2X3smarkXsXsactiveXsXplusmarkX1X2plusX1X2plusX1markX2plusX1X2plusactiveX1X2plusX1X2plusX1activeX2plusX1X2U31markXU31XU31activeXU31XU41markX1X2X3U41X1X2X3U41X1markX2X3U41X1X2X3U41X1X2markX3U41X1X2X3U41activeX1X2X3U41X1X2X3U41X1activeX2X3U41X1X2X3U41X1X2activeX3U41X1X2X3xmarkX1X2xX1X2xX1markX2xX1X2xactiveX1X2xX1X2xX1activeX2xX1X2andmarkX1X2andX1X2andX1markX2andX1X2andactiveX1X2andX1X2andX1activeX2andX1X2isNatmarkXisNatXisNatactiveXisNatX2.1U1120tt01U2134s13plus24U3116005U4137x27and22active11U11212tt0mark11U213321s11plus212U311100U413231x221and212isNat11markU11X1X2activeU11markX1X2markttactivettmarkU21X1X2X3activeU21markX1X2X3marksXactivesmarkXmarkplusX1X2activeplusmarkX1markX2markU31XactiveU31markXmark0active0markU41X1X2X3activeU41markX1X2X3markxX1X2activexmarkX1markX2markandX1X2activeandmarkX1X2markisNatXactiveisNatXU11markX1X2U11X1X2U11X1markX2U11X1X2U11activeX1X2U11X1X2U11X1activeX2U11X1X2U21markX1X2X3U21X1X2X3U21X1markX2X3U21X1X2X3U21X1X2markX3U21X1X2X3U21activeX1X2X3U21X1X2X3U21X1activeX2X3U21X1X2X3U21X1X2activeX3U21X1X2X3smarkXsXsactiveXsXplusmarkX1X2plusX1X2plusX1markX2plusX1X2plusactiveX1X2plusX1X2plusX1activeX2plusX1X2U31markXU31XU31activeXU31XU41markX1X2X3U41X1X2X3U41X1markX2X3U41X1X2X3U41X1X2markX3U41X1X2X3U41activeX1X2X3U41X1X2X3U41X1activeX2X3U41X1X2X3U41X1X2activeX3U41X1X2X3xmarkX1X2xX1X2xX1markX2xX1X2xactiveX1X2xX1X2xX1activeX2xX1X2andmarkX1X2andX1X2andX1markX2andX1X2andactiveX1X2andX1X2andX1activeX2andX1X2isNatmarkXisNatXisNatactiveXisNatX1mark1121U11211112active111tt02U213111223s111plus222112U31111001U4131111223x222112and21112isNat1211markU21X1X2X3activeU21markX1X2X3marksXactivesmarkXmarkplusX1X2activeplusmarkX1markX2markU31XactiveU31markXmarkxX1X2activexmarkX1markX2markandX1X2activeandmarkX1X2U11activeX1X2U11X1X2U11X1activeX2U11X1X2U21activeX1X2X3U21X1X2X3U21X1activeX2X3U21X1X2X3U21X1X2activeX3U21X1X2X3sactiveXsXplusactiveX1X2plusX1X2plusX1activeX2plusX1X2U31activeXU31XU41activeX1X2X3U41X1X2X3U41X1activeX2X3U41X1X2X3U41X1X2activeX3U41X1X2X3xactiveX1X2xX1X2xX1activeX2xX1X2andactiveX1X2andX1X2andX1activeX2andX1X2isNatactiveXisNatX1mark1221U2132211213active111s1211plus221112U31111x221112and211112U1122122U413112223isNat121markU21X1X2X3activeU21markX1X2X3markplusX1X2activeplusmarkX1markX2markU31XactiveU31markXmarkxX1X2activexmarkX1markX2U11activeX1X2U11X1X2U11X1activeX2U11X1X2U21activeX1X2X3U21X1X2X3U21X1activeX2X3U21X1X2X3U21X1X2activeX3U21X1X2X3sactiveXsXplusactiveX1X2plusX1X2plusX1activeX2plusX1X2U31activeXU31XU41activeX1X2X3U41X1X2X3U41X1activeX2X3U41X1X2X3U41X1X2activeX3U41X1X2X3xactiveX1X2xX1X2xX1activeX2xX1X2andactiveX1X2andX1X2andX1activeX2andX1X2isNatactiveXisNatX1mark1121U2131111213active111plus221112U311111x221112U1121112s121U413212223and21112isNat121U11activeX1X2U11X1X2U11X1activeX2U11X1X2U21activeX1X2X3U21X1X2X3U21X1activeX2X3U21X1X2X3U21X1X2activeX3U21X1X2X3sactiveXsXplusactiveX1X2plusX1X2plusX1activeX2plusX1X2U31activeXU31XU41activeX1X2X3U41X1X2X3U41X1activeX2X3U41X1X2X3U41X1X2activeX3U41X1X2X3xactiveX1X2xX1X2xX1activeX2xX1X2andactiveX1X2andX1X2andX1activeX2andX1X2isNatactiveXisNatX1U1121112active1221U213111213s111plus21112U31111U413111213x21112and21112isNat111AProVEAProVE Commit ID: 48fb2092695e11cc9f56e44b17a92a5f88ffb256 marcel 20180622 unpublished dirty Statistics for single proof: 100.00 % (6 real / 0 unknown / 0 assumptions / 6 total proof steps)http://aprove.informatik.rwth-aachen.deJohnDoe