Theorem eqstr3 | index | src |

theorem eqstr3 (A B C: set): $ B == A -> B == C -> A == C $;
StepHypRefExpression
1 eqstr
A == B -> B == C -> A == C
2 eqscom
B == A -> A == B
3 1, 2 syl
B == A -> B == C -> A == C

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp), axs_pred_calc (ax_gen, ax_4)