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Related theorems GIF version |
| Description: Extend wff definition to
include atomic formulas using the equality
predicate.
(Instead of introducing weq 955 as an axiomatic statement, as was done in an older version of this database, we introduce it by "proving" a special case of set theory's more general wceq 954. This lets us avoid overloading the = connective, thus preventing ambiguity that causes problems in certain Metamath parsers. However, logically weq 955 is considered to be a primitive syntax, even though here it is artificially "derived" from wceq 954. Note: To see the proof steps of this syntax proof, type "show proof weq /all" in the Metamath program.) |
| Ref | Expression |
|---|---|
| weq | wff x = y |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | wceq 954 | 1 wff x = y |
| Colors of variables: wff set class |
| Syntax hints: = wceq 954 |
| This theorem is referenced by: ax4 970 ax9o 1120 ax9 1122 a9e 1123 equid 1124 stdpc6 1125 equcomi 1126 equcom 1127 equcoms 1128 equtr 1129 equtrr 1130 equtr2 1131 equequ1 1132 equequ2 1133 elequ1 1134 elequ2 1135 ax11i 1136 ax10 1139 alequcoms 1141 nalequcoms 1142 hbae 1143 hbaes 1144 hbnae 1145 hbnaes 1146 equs3 1147 equs4 1148 equsal 1149 equsex 1150 dvelimfALT 1151 dral1 1152 dral2 1153 drex1 1154 drex2 1155 a4imt 1156 a4im 1157 a4ime 1158 a4imed 1159 cbv1 1160 cbv2 1161 cbv3 1162 cbval 1163 cbvex 1164 chvar 1165 equvini 1166 sbimi 1171 drsb1 1173 sb1 1174 sb2 1175 sbequ1 1176 sbequ2 1177 sbequ12 1179 sbequ12r 1180 sbequ12a 1181 sbid 1182 stdpc4 1183 sbf 1184 sb6x 1186 hbs1f 1187 sbequ5 1188 sbequ6 1189 sbt 1190 equsb1 1191 equsb2 1192 sbied 1193 sbie 1194 equs5a 1195 equs5e 1196 equs45f 1198 sb6f 1199 sb5f 1200 aev 1206 ax16 1207 ax17eq 1209 dveeq2 1210 dveeq2ALT 1211 ax11v2 1213 ax11a2 1214 ax11 1217 ax11b 1218 sb3 1220 sb4 1221 sb4b 1222 dfsb2 1223 dfsb3 1224 hbsb2 1225 sbequi 1226 sbequ 1227 drsb2 1228 sbi1 1230 sbequ8 1245 hbsb4 1246 hbsb4t 1247 dvelimf 1248 dvelimdf 1249 sbco 1250 sbidm 1252 sbco2 1253 sbco3 1255 sbcom 1256 sb5rf 1257 sb6rf 1258 sb9i 1261 ax11v 1263 sb56 1264 sb6 1265 sb5 1266 equid1 1267 a4v 1270 a4eiv 1272 equvin 1273 a16g 1274 a16gb 1275 cbval2 1314 cbvex2 1315 cbvald 1318 cbvexd 1319 cbvex4v 1320 cleljust 1326 equsb3lem 1327 equsb3 1328 elsb3 1329 hbs1 1330 hbsb 1331 sbcom2 1332 2sb5 1333 2sb6 1334 sb6a 1335 2sb5rf 1336 2sb6rf 1337 dfsb7 1338 sb7f 1339 sb10f 1340 sbelx 1342 sbel2x 1343 sbal1 1344 sbal 1345 exsb 1348 2exsb 1349 dveeq1 1352 dveeq1ALT 1353 sbal2 1356 ax15 1357 ax17el 1359 ax11eq 1361 ax11el 1362 ax11f 1363 ax11indn 1364 ax11indi 1365 ax11indalem 1366 ax11inda2 1368 ax11inda 1369 a12stdy1 1370 a12stdy3 1372 a12stdy4 1373 a12lem1 1374 a12lem2 1375 a12study 1376 a12studyALT 1377 euf 1382 eubid 1383 eubii 1385 hbeu1 1386 hbeu 1387 sb8eu 1388 eu1 1390 mo 1391 euex 1392 eumo0 1393 eu2 1394 eu3 1395 mo2 1398 mo3 1399 mo4f 1400 mobii 1403 eu5 1407 eu4 1408 immo 1415 moimv 1417 moanim 1425 mopick 1431 2mo 1445 2mos 1446 2eu4 1450 2eu5 1451 2eu6 1452 exists1 1455 exists2 1456 funop 3549 cbvrexf 10410 infi1 10419 ficli 10440 homcard 10498 fgsb2 10521 icmpmon 10659 idmon 10660 |