Except software isn’t math. Math is entirely self contained and self defining. Software has dependencies in hardware and other software that are not contained

Except software isn’t math. Math is entirely self contained and self defining. Software has dependencies in hardware and other software that are not contained in the software. A better analogy is the symbolism of an algebra and way of expressing math. While calculus hasn’t changed for techniques known at the time, fluxions aren’t supported as a method and symbology while a derivation of liebnitz’ notation is. The math is invariant but the symbology and evaluation methods change with time. Likewise hardware architectures change, and it’s absurd to assert machine code from the Eniac must run on every architecture, as well as every variation of every machine ever made on every future hardware in perpetuity. There are to this point many preservation efforts that create emulators that run on modern hardware or reference virtual machines that can be carried forward. But to expect this to be done in situ everywhere all the time for everything is on the surface absurd and unreasonable to an extreme. Edit: the Eniac didn’t have machine code, but switches and wiring - even more to my point. While it’s still just math and logic, it’s not reasonable to carry forward all software configurations of the machine.