Theorem b1odd | index | src |

theorem b1odd (n: nat): $ odd (b1 n) $;
StepHypRefExpression
1 odddvd
odd (b1 n) <-> ~2 || b1 n
2 b1dvd2
~2 || b1 n
3 1, 2 mpbir
odd (b1 n)

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp, itru), axs_pred_calc (ax_gen, ax_4, ax_5, ax_6, ax_7, ax_10, ax_11, ax_12), axs_set (elab, ax_8), axs_the (theid, the0), axs_peano (peano1, peano2, peano5, addeq, muleq, add0, addS, mul0, mulS)