>>13888970It wouldn't 'stab' through the steel at all. It would melt while still remaining solid(like a fluid under immense pressure is) and merge with it, assuming the knife is also steel. You wouldn't be able to pull it out once its in.
When two physical objects make contact, their atoms don't touch: they are mostly empty-space. What you have are electron fields that are the same charge and so repel each other. 'Sharpness' in this context is simply referring to minimising the interaction between two different electron fields. As the scenario stipulates that the knife has 'absolute' durability, it's electron field must also be over-coming that of the slab to accommodate this magic-rule.
The energy for this bonding process(a chemical change) would come from the same place the knife's durability does: The Invisible Penis Dimension
